Submission #128844

#	Time	Username	Problem	Language	Result	Execution time	Memory
128844		Plurm	Cake 3 (JOI19_cake3)	C++11	0 / 100	10 ms	892 KiB

cake3

#include <bits/stdc++.h>
using namespace std;
long long sv[2048][2048];
int main(){
    int n,m;
    scanf("%d%d",&n,&m);
    int v,c;
    vector<pair<int,int> > pieces;
    for(int i = 0; i < n; i++){
        scanf("%d%d",&v,&c);
        pieces.emplace_back(v,c);
    }
    sort(pieces.begin(), pieces.end(), [](pair<int,int> x, pair<int,int> y){
        swap(x.first, x.second);
        swap(y.first, y.second);
        return x < y;
    });
    for(int i = 0; i < n; i++){
        long long highsum = 0ll;
        for(int j = i+m-1; j < n; j++){
            priority_queue<int, vector<int>, greater<int> > pq;
            for(int k = i; k <= j; k++){
                pq.push(pieces[k].first);
            }
            while(pq.size() > m) pq.pop();
            while(!pq.empty()){
                highsum += 1ll * pq.top();
                pq.pop();
            }
            sv[i][j] = highsum;
            highsum = 0ll;
        }
    }
    long long ans = 0ll;
    for(int i = 0; i < n; i++){
        for(int j = i+m-1; j < n; j++){
            ans = max(ans, sv[i][j] + 2ll * pieces[i].second - 2ll * pieces[j].second);
        }
    }
    printf("%lld\n",ans);
    return 0;
}

Compilation message (stderr)

cake3.cpp: In function 'int main()':
cake3.cpp:25:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             while(pq.size() > m) pq.pop();
                   ~~~~~~~~~~^~~
cake3.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
cake3.cpp:10:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&v,&c);
         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 19
• Subtask 3: 0 / 76