Submission #928910

#	Time	Username	Problem	Language	Result	Execution time	Memory
928910		Warinchai	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	300 ms	21700 KiB

bobek

#include<bits/stdc++.h>
#define int long long
using namespace std;
int ar[45];
vector<int>first;
vector<int>second;
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,m;cin>>n>>m;
    int md=n/2;
    int m2=n-md;
    for(int i=1;i<=n;i++){
        cin>>ar[i];
    }
    for(int i=0;i<(1<<md);i++){
        int sum=0;
        for(int j=0;j<md;j++){
            if((i>>j)&1)sum+=ar[j+1];
        }
        //cerr<<i<<" "<<sum<<"\n";
        if(sum<=m)first.push_back(sum);
    }
    for(int i=0;i<(1<<m2);i++){
        int sum=0;
        for(int j=0;j<m2;j++){
            if((i>>j)&1)sum+=ar[md+j+1];
        }
        if(sum<=m)second.push_back(sum);
    }
    sort(first.begin(),first.end());
    sort(second.begin(),second.end(),greater<int>());
    /*for(auto x:first)cerr<<x<<" ";
    cerr<<"\n";
    for(auto x:second)cerr<<x<<" ";
    cerr<<"\n";*/
    int cur=0;
    int ans=0;
    for(auto x:first){
        while(cur<second.size()&&x+second[cur]>m){
            cur++;
        }
        ans+=second.size()-cur;
    }

    cout<<ans;
}

Compilation message (stderr)

bobek.cpp: In function 'int32_t main()':
bobek.cpp:40:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         while(cur<second.size()&&x+second[cur]>m){
      |               ~~~^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10