Submission #628794

#	Time	Username	Problem	Language	Result	Execution time	Memory
628794		Iwanttobreakfree	Tug of War (BOI15_tug)	C++17	18 / 100	3081 ms	262144 KiB

tug

#include <iostream>
#include <vector>
using namespace std;
bool bt(int i,vector<pair<int,int>> pos,int l,int r,int k,vector<int>& posl,vector<int>& posr,vector<int>& s){
    if(i==pos.size()&&abs(l-r)<=k)return true;
    else if(i==pos.size())return false;
    if(posl[pos[i].first]){
        posl[pos[i].first]=0;
        l+=s[i];
        if(bt(i+1,pos,l,r,k,posl,posr,s))return true;
        posl[pos[i].first]=1;
        l-=s[i];
    }
    if(posr[pos[i].second]){
        posr[pos[i].second]=0;
        r+=s[i];
        if(bt(i+1,pos,l,r,k,posl,posr,s))return true;
        posr[pos[i].second]=1;
        r-=s[i];
    }
    return false;
}
int main(){
    int n,k;
    cin>>n>>k;
    vector<pair<int,int>> pos(2*n);
    vector<int> posl(n,1),posr(n,1),s(2*n);
    for(int i=0;i<2*n;i++)cin>>pos[i].first>>pos[i].second>>s[i];
    for(int i=0;i<2*n;i++){
        pos[i].first--;pos[i].second--;
    }
    if(bt(0,pos,0,0,k,posl,posr,s))cout<<"YES\n";
    else cout<<"NO\n";
}

Compilation message (stderr)

tug.cpp: In function 'bool bt(int, std::vector<std::pair<int, int> >, int, int, int, std::vector<int>&, std::vector<int>&, std::vector<int>&)':
tug.cpp:5:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 |     if(i==pos.size()&&abs(l-r)<=k)return true;
      |        ~^~~~~~~~~~~~
tug.cpp:6:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |     else if(i==pos.size())return false;
      |             ~^~~~~~~~~~~~

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