Submission #1021849

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021849		guagua0407	Tug of War (BOI15_tug)	C++17	0 / 100	24 ms	604 KiB

tug

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

int main() {_
    int n,k;
    cin>>n>>k;
    vector<int> l(2*n),r(2*n),S(2*n);
    int all=0;
    vector<int> cntr(n),cntl(n);
    for(int i=0;i<2*n;i++){
        cin>>l[i]>>r[i]>>S[i];
        l[i]--;
        r[i]--;
        cntl[l[i]]++;
        if(cntl[l[i]]==3) assert(false);
        cntr[r[i]]++;
        if(cntr[r[i]]==3) assert(false);
        all+=S[i];
    }
    for(int i=0;i<(1<<(2*n));i++){
        if(__builtin_popcount(i)!=n) continue;
        vector<int> L(n),R(n);
        bool tf=true;
        int sum=0;
        for(int j=0;j<2*n;j++){
            if(i&(1<<j)){
                if(L[l[j]]) tf=false;
                L[l[j]]=1;
                sum+=S[j];
            }
            else{
                if(R[r[j]]) tf=false;
                R[r[j]]=1;
            }
        }
        if(!tf) continue;
        if(abs(sum-(all-sum))<=k){
            cout<<"YES"<<'\n';
            return 0;
        }
    }
    cout<<"NO"<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

tug.cpp: In function 'void setIO(std::string)':
tug.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tug.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 18
• Subtask 2: 0 / 30
• Subtask 3: 0 / 23
• Subtask 4: 0 / 29