Submission #128818

#	Time	Username	Problem	Language	Result	Execution time	Memory
128818		Plurm	Cake 3 (JOI19_cake3)	C++11	0 / 100	3 ms	1016 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){
        return x.second < y.second;
    });
    m -= 2;
    for(int i = 0; i+m-1 < n; i++){
        long long highsum = 0ll;
        multiset<int> ms;
        for(int j = i; j < i+m; j++){
            highsum += 1ll * pieces[j].first;
            ms.insert(pieces[j].first);
        }
        sv[i][i+m-1] = highsum;
        for(int j = i+m; j < n; j++){
            if(pieces[j].first > *ms.begin()){
                highsum -= 1ll * *ms.begin();
                ms.erase(ms.begin());
                ms.insert(pieces[j].first);
                highsum += 1ll * pieces[j].first;
            }
            sv[i][j] = highsum;
        }
    }
    m += 2;
    long long ans = 0ll;
    for(int i = 0; i+m < n; i++){
        for(int j = i+m; j < n; j++){
            ans = max(ans, sv[i+1][j-1] + 1ll * pieces[i].first + 1ll * pieces[j].first + 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: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