Team Round #3:2017ICPC沈阳站

Team Round(Training)系列:每周六12:15-17:15

这一场是在9月21日打的,是2017ICPC沈阳站(搬题人:Wqr_(威威大毒瘤,dqy都自闭了))

写了KIF

就感觉思路不够开阔把,有点盲目自信,认为现场赛很多人过了就不难,把题目想的简单化。

K:左右各扫一次

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 /************************************************
# @Author: miniLCT
# @DateTime: 2019-09-21 12:17:21
# @Description: You build it.You run it
***********************************************/
#include <bits/stdc++.h>

using namespace std;
#define int long long
#define eps 1e-8
#define close ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
typedef long long ll;
const int maxn = 1e6;
const int INF = 1e9;
const ll linf = 0x3f3f3f3f3f3f3f3f;
const double PI = acos(-1.0);
ll mod = 1e9+7;
int a[maxn];
main()
{
int t ;
cin >> t;
while(t--){
int n ;
cin >> n;
for(int i = 1; i <= n;i++){
cin >> a[i];
}
//sort(a, a+n);
int ans1 = 0;
for(int i = 3; i <= n;i++){
if(a[i] - a[i-1] > 1)ans1 += (a[i] - a[i-1] - 1);
}
int ans2 = 0;
for(int i = n-1; i >= 2;i--){
if(a[i] - a[i-1] > 1)ans2 += (a[i] - a[i-1] - 1);
}
int ans = max(ans1,ans2);
cout << ans << endl;
}

}

/******************************************************
stuff you should look for
* int overflow, array bounds
* special cases (n=1?), set tle
* do smth instead of nothing and stay organized
*******************************************************/

I:大数加法 求a+b+c+d a,b,c,d在2^62范围内

java代码

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import java.math.BigInteger;
import java.util.Scanner;

class Main{
public static void main(String[] args) {
int t;
Scanner sc = new Scanner(System.in);
t = sc.nextInt();
while(t > 0){
t--;
BigInteger a = sc.nextBigInteger();
BigInteger b = sc.nextBigInteger();
BigInteger c = sc.nextBigInteger();
BigInteger d = sc.nextBigInteger();
BigInteger out = BigInteger.ZERO;
out = out.add(a);
out = out.add(b);
out = out.add(c);
out = out.add(d);
System.out.println(out.toString());

}
}
}

事实上数据给的是ull范围,处理一下2^64就行了

cpp代码1:

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#include<bits/stdc++.h> 
using namespace std;

typedef unsigned long long ULL;

int main()
{

int t;
scanf("%d", &t);
while(t--) {
ULL a, b, c, d, maxv = ((ULL)1 << 62);
scanf("%llu%llu%llu%llu", &a, &b, &c, &d);
if(a == maxv && b == maxv && c == maxv && d == maxv)
printf("18446744073709551616\n"); // 4个2^62之和
else
printf("%llu\n", a + b + c + d);
}
return 0;
}

cpp模拟加法写法:

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#include<iostream>
#include<cmath>
#include<algorithm>
#include<cstring>
#include<cstdio>
#include<map>
#include<vector>
#include<stack>
#include<queue>
#include<set>
#define mod 998244353;
#define Max 0x3f3f3f3f;
#define Min 0xc0c0c0c0;
#define mst(a) memset(a,0,sizeof(a))
#define f(i,a,b) for(int i=a;i<b;i++)
using namespace std;
typedef long long ll;
const int maxn=100005;
ll temp;
void add(char* a,char* b,char* c)
{
int i,j,k,max,min,temp;
char *s,*pmax,*pmin;
max=strlen(a);
min=strlen(b);
if (max<min)
{
temp=max;
max=min;
min=temp;
pmax=b;
pmin=a;
}
else
{
pmax=a;
pmin=b;
}
s=(char*)malloc(sizeof(char)*(max+1));
s[0]='0';
for (i=min-1,j=max-1,k=max;i>=0;i--,j--,k--)
s[k]=pmin[i]-'0'+pmax[j];
for (;j>=0;j--,k--)
s[k]=pmax[j];
for (i=max;i>=0;i--)
if (s[i]>'9')
{
s[i]-=10;
s[i-1]++;
}
if (s[0]=='0')
{
for (i=0;i<=max;i++)
c[i-1]=s[i];
c[i-1]='\0';
}
else
{
for (i=0;i<=max;i++)
c[i]=s[i];
c[i]='\0';
}
free(s);
}
int main(){
ios::sync_with_stdio(false);
int n;
while(cin>>n){
while(n--){
char a[105],b[105],c[105],d[105],ans[105];
cin>>a>>b>>c>>d;
add(a,b,ans);
add(ans,c,ans);
add(ans,d,ans);
cout<<ans<<endl;
}
}
return 0;
}

————————————————
版权声明:本文为CSDN博主「html_11」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/qq1013459920/article/details/82634156

cpp代码3:long double 就行了

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#include <bits/stdc++.h>

#define ll long long

using namespace std;

void scan() {
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}


const int maxn = 1e6 + 7;
ll a[maxn], b[maxn];

int main() {
ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
scan();

int t;
cin >> t;
while (t--) {
long double a, b, c, d;
cin >> a >> b >> c >> d;
cout << fixed << setprecision(0) << (a + b + c + d) << endl;
}
return 0;
}
————————————————
版权声明:本文为CSDN博主「布呗之路」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/hypHuangYanPing/article/details/99694803

F:打表找规律

我写这道题时候打表打的有点多,到后面很迷惑人,double出锅,如果只看前几项容易得到 a[n] = 4*a[n-1] - a[n] - 2;

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import java.math.BigInteger;
import java.util.*;

class Main{
public static void main(String[] args) {
Scanner cin = new Scanner(System.in);
BigInteger bigint[] = new BigInteger [160];
bigint[1] = new BigInteger("4");
bigint[2] = new BigInteger("14");
for(int i = 3; i < 155; i++){
bigint[i] = bigint[i-1].multiply(BigInteger.valueOf(4)).subtract(bigint[i-2]);
}
int t;
t = cin.nextInt();
while(t>0){
t = t-1;
BigInteger n;
n = cin.nextBigInteger();
/*
* if(n.equals(BigInteger.valueOf(1)) || n.equals(BigInteger.valueOf(2))){
* System.out.println(-1); continue;
*/
for (int i = 1; i < 150; i++) {
if (bigint[i].compareTo(n) == 1 || bigint[i].compareTo(n) == 0) {
System.out.println(bigint[i].toString());
break;
}
}
}
}
}

附c++大数模板

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#include <bits/stdc++.h>
#define rep(i,a,n) for(int i=a;i<n;++i)
#define per(i,a,n) for(int i=n-1;i>=a;--i)
#define fi first
#define se second
using namespace std;
// base and base_digits must be consistent
constexpr int base = 1000000000;
constexpr int base_digits = 9;
struct bigint{
vector<int> z;
int sign;
bigint() : sign(1) {}
bigint(long long v) { *this = v; }
bigint& operator=(long long v)
{
sign = v < 0 ? -1 : 1;
v*=sign;
z.clear();
for(; v > 0; v = v / base) z.push_back((int)(v % base));
return *this;
}

bigint(const string& s) { read(s); }

bigint& operator+=(const bigint& other)
{
if (sign == other.sign)
{
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i)
{
if(i==z.size()) z.push_back(0);
z[i] += carry + (i < other.z.size() ? other.z[i] : 0);
carry = z[i] >= base;
if(carry) z[i] -= base;
}
}
else if (other != 0 /* prevent infinite loop */)
{
*this -= -other;
}
return *this;
}

friend bigint operator+(bigint a, const bigint& b)
{
return a += b;
}

bigint& operator-=(const bigint& other)
{
if (sign == other.sign)
{
if (sign == 1 && *this >= other || sign == -1 && *this <= other)
{
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i)
{
z[i] -= carry + (i < other.z.size() ? other.z[i] : 0);
carry = z[i] < 0;
if(carry) z[i] += base;
}
trim();
}
else
{
*this = other - *this;
this->sign = -this->sign;
}
}
else *this += -other;
return *this;
}

friend bigint operator - (bigint a,const bigint& b)
{
return a -= b;
}

bigint& operator*=(int v)
{
if(v<0) sign=-sign,v=-v;
for(int i=0,carry=0;i<z.size() || carry;++i)
{
if(i==z.size()) z.push_back(0);
long long cur = (long long)z[i] * v + carry;
carry = (int)(cur / base);
z[i] = (int)(cur % base);
}
trim();
return *this;
}

bigint operator*(int v) const
{
return bigint(*this) *= v;
}

friend pair<bigint, bigint> divmod(const bigint& a1, const bigint& b1)
{
int norm = base / (b1.z.back() + 1);
bigint a = a1.abs() * norm;
bigint b = b1.abs() * norm;
bigint q, r;
q.z.resize(a.z.size());

for (int i = (int)a.z.size() - 1; i >= 0; i--)
{
r*=base; r+=a.z[i];
int s1 = b.z.size() < r.z.size() ? r.z[b.z.size()] : 0;
int s2 = b.z.size() - 1 < r.z.size() ? r.z[b.z.size() - 1] : 0;
int d = (int)(((long long)s1 * base + s2) / b.z.back());
r -= b * d;
while(r < 0) r+=b,--d;
q.z[i] = d;
}

q.sign = a1.sign * b1.sign;
r.sign = a1.sign;
q.trim();
r.trim();
return {q, r / norm};
}

friend bigint sqrt(const bigint& a1)
{
bigint a=a1;
while(a.z.empty()||a.z.size()%2==1) a.z.push_back(0);

int n = a.z.size();
int firstDigit = (int)::sqrt((double)a.z[n - 1] * base + a.z[n - 2]);
int norm = base / (firstDigit + 1);
a *= norm;
a *= norm;
while(a.z.empty()||a.z.size()%2==1) a.z.push_back(0);

bigint r = (long long)a.z[n - 1] * base + a.z[n - 2];
firstDigit = (int)::sqrt((double)a.z[n - 1] * base + a.z[n - 2]);
int q = firstDigit;
bigint res;
for (int j = n / 2 - 1; j >= 0; j--)
{
for(;;--q)
{
bigint r1=(r-(res*2*base+q)*q)*base*base+(j>0?(long long)a.z[2*j-1]*base+a.z[2*j-2]:0);
if(r1>=0) { r=r1; break; }
}
res*=base;res+=q;
if(j>0)
{
int d1 = res.z.size() + 2 < r.z.size() ? r.z[res.z.size() + 2] : 0;
int d2 = res.z.size() + 1 < r.z.size() ? r.z[res.z.size() + 1] : 0;
int d3 = res.z.size() < r.z.size() ? r.z[res.z.size()]:0;
q = (int)(((long long)d1*base*base+(long long)d2*base+d3)/(firstDigit*2));
}
}

res.trim();
return res / norm;
}

bigint operator/(const bigint& v) const
{
return divmod(*this, v).first;
}

bigint operator%(const bigint& v) const
{
return divmod(*this, v).second;
}

bigint& operator/=(int v)
{
if(v<0) sign=-sign,v=-v;
for (int i = (int)z.size() - 1, rem = 0; i >= 0; --i)
{
long long cur = z[i] + rem * (long long)base;
z[i] = (int)(cur / v);
rem = (int)(cur % v);
}
trim();
return *this;
}

bigint operator/(int v) const
{
return bigint(*this) /= v;
}

int operator%(int v) const
{
if(v<0) v=-v;
int m=0;
for(int i=(int)z.size()-1;i>=0;--i) m=(int)((z[i]+m*(long long)base)%v);
return m * sign;
}

bigint& operator*=(const bigint& v)
{
*this = *this * v;
return *this;
}

bigint& operator/=(const bigint& v)
{
*this = *this / v;
return *this;
}

bool operator<(const bigint& v) const
{
if(sign!=v.sign) return sign < v.sign;
if(z.size()!=v.z.size()) return z.size()*sign<v.z.size()*v.sign;
for(int i = (int)z.size() - 1; i >= 0; i--)
if(z[i] != v.z[i]) return z[i] * sign < v.z[i] * sign;
return false;
}

bool operator>(const bigint& v) const { return v < *this; }
bool operator<=(const bigint& v) const { return !(v < *this); }
bool operator>=(const bigint& v) const { return !(*this < v); }
bool operator==(const bigint& v) const { return !(*this < v) && !(v < *this); }
bool operator!=(const bigint& v) const { return *this < v || v < *this; }

void trim()
{
while(!z.empty() && z.back() == 0) z.pop_back();
if(z.empty()) sign = 1;
}

bool isZero() const { return z.empty(); }

friend bigint operator-(bigint v)
{
if(!v.z.empty()) v.sign = -v.sign;
return v;
}

bigint abs() const
{
return sign == 1 ? *this : -*this;
}

long long longValue() const
{
long long res = 0;
for(int i = (int)z.size() - 1; i >= 0; i--) res = res * base + z[i];
return res * sign;
}

friend bigint gcd(const bigint& a, const bigint& b)
{
return b.isZero() ? a : gcd(b, a % b);
}

friend bigint lcm(const bigint& a, const bigint& b)
{
return a / gcd(a, b) * b;
}

void read(const string& s)
{
sign = 1;
z.clear();
int pos = 0;
while(pos < s.size() && (s[pos] == '-' || s[pos] == '+'))
{
if(s[pos] == '-') sign = -sign;
++pos;
}
for(int i=(int)s.size()-1;i>=pos;i-=base_digits)
{
int x=0;
for(int j=max(pos,i-base_digits+1);j<=i;j++) x=x*10+s[j]-'0';
z.push_back(x);
}
trim();
}

friend istream& operator>>(istream& stream, bigint& v)
{
string s;
stream >> s;
v.read(s);
return stream;
}

friend ostream& operator<<(ostream& stream, const bigint& v)
{
if(v.sign == -1) stream << '-';
stream << (v.z.empty() ? 0 : v.z.back());
for(int i = (int)v.z.size() - 2; i >= 0; --i)
stream << setw(base_digits) << setfill('0') << v.z[i];
return stream;
}

static vector<int> convert_base(const vector<int>& a, int old_digits, int new_digits)
{
vector<long long> p(max(old_digits, new_digits) + 1);
p[0] = 1;
for(int i=1;i<p.size();i++) p[i]=p[i-1]*10;
vector<int> res;
long long cur = 0;
int cur_digits = 0;
for(int v : a)
{
cur += v * p[cur_digits];
cur_digits += old_digits;
while (cur_digits >= new_digits)
{
res.push_back(int(cur % p[new_digits]));
cur /= p[new_digits];
cur_digits -= new_digits;
}
}
res.push_back((int)cur);
while(!res.empty() && res.back()==0)
res.pop_back();
return res;
}

typedef vector<long long> vll;
static vll karatsubaMultiply(const vll& a, const vll& b)
{
int n=a.size();
vll res(n + n);
if(n <= 32)
{
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
res[i + j] += a[i] * b[j];
return res;
}

int k = n >> 1;
vll a1(a.begin(), a.begin() + k);
vll a2(a.begin() + k, a.end());
vll b1(b.begin(), b.begin() + k);
vll b2(b.begin() + k, b.end());
vll a1b1 = karatsubaMultiply(a1, b1);
vll a2b2 = karatsubaMultiply(a2, b2);
for(int i=0;i<k;i++) a2[i]+=a1[i];
for(int i=0;i<k;i++) b2[i]+=b1[i];

vll r = karatsubaMultiply(a2, b2);
for(int i=0;i<a1b1.size();i++) r[i]-=a1b1[i];
for(int i=0;i<a2b2.size();i++) r[i]-=a2b2[i];
for(int i=0;i<r.size();i++) res[i+k]+=r[i];
for(int i=0;i<a1b1.size();i++) res[i]+=a1b1[i];
for(int i = 0;i<a2b2.size();i++) res[i+n]+=a2b2[i];
return res;
}

bigint operator*(const bigint& v) const
{
vector<int> a6=convert_base(this->z,base_digits,6);
vector<int> b6=convert_base(v.z,base_digits,6);
vll a(a6.begin(),a6.end());
vll b(b6.begin(),b6.end());
while(a.size()<b.size()) a.push_back(0);
while(b.size()<a.size()) b.push_back(0);
while(a.size()&(a.size()-1)) a.push_back(0),b.push_back(0);
vll c=karatsubaMultiply(a, b);
bigint res;
res.sign = sign * v.sign;
for (int i = 0, carry = 0; i < c.size(); i++)
{
long long cur = c[i] + carry;
res.z.push_back((int)(cur % 1000000));
carry = (int)(cur / 1000000);
}
res.z = convert_base(res.z, 6, base_digits);
res.trim();
return res;
}
};

bigint qpow(bigint a,bigint b){
bigint ans=1;
while(b!=0){
if(b%2){
ans= ans*a;
}
b/=2;
a= a*a;
}
return ans;

}


struct Matrix
{
bigint a[2][2];
Matrix()
{
rep(i,0,2){
rep(j,0,2){
a[i][j]=0;
}
}
}
Matrix operator * (const Matrix y)
{
Matrix ans;
for(int i = 0; i < 2; i++)
for(int j = 0; j < 2; j++)
for(int k = 0; k < 2; k++)
ans.a[i][j] = ans.a[i][j] + (a[i][k]*y.a[k][j]);
return ans;
}
Matrix operator = (const Matrix y)
{
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
a[i][j]=y.a[i][j];
}
Matrix operator *= (const Matrix y)
{
Matrix ans;
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
for(int k=0;k<2;k++)
ans.a[i][j] = ans.a[i][j] + (a[i][k]*y.a[k][j]);

for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
a[i][j]=ans.a[i][j];
}
};

Matrix qpow(bigint x)
{
Matrix ans;
ans.a[0][0]=ans.a[1][1]=1; //单位矩阵
Matrix mul;
mul.a[0][0]=4;
mul.a[0][1]=-1;
mul.a[1][0]=1;
mul.a[1][1]=0;
while(x!=0)
{
if(x%2!=0)
ans = ans*mul;
mul = mul* mul;
x/=2;
}
return ans;
}
bigint ans[1005];
void solve(){


ans[0]=(bigint)4;
ans[1]=(bigint)14;
ans[2]=(bigint)52;
rep(i,2,200){
ans[i]=(bigint)4*ans[i-1]-ans[i-2];
// cout<<ans[i]<<endl;
}

}
int main()
{
solve();
int t;cin>>t;
while(t--){
bigint n;
cin>>n;
rep(i,0,200){
if(ans[i]>=n){
cout<<ans[i]<<endl;
break;
}
}


}
}

补题:

L题:

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#include<bits/stdc++.h>
#define N 201000
#define LL long long

using namespace std;

vector<int> g[N];
int n,m,sz[N];

void getsize(int x,int fa)
{
sz[x]=1;
for(int i=0;i<g[x].size();i++)
{
int y=g[x][i];
if (y==fa) continue;
getsize(y,x); sz[x]+=sz[y];
}
}

int main()
{
int T_T;
cin>>T_T;
while(T_T--)
{
scanf("%d%d",&n,&m);
memset(g,0,sizeof(g));
for(int i=1;i<n;i++)
{
int u,v;
scanf("%d%d",&u,&v);
g[u].push_back(v);
g[v].push_back(u);
}
int ans=0;
getsize(1,0);
for(int i=1;i<=n;i++)
if (sz[i]>=m&&n-sz[i]>=m) ans++;
printf("%d\n",ans);
}
}
-------------本文结束感谢您的阅读-------------