Submission #101864

#	Time	Username	Problem	Language	Result	Execution time	Memory
101864		rocketninja7	Safety (NOI18_safety)	C++14	100 / 100	405 ms	20600 KiB

safety

#include <cstdio>
#include <vector>
#include <set>
using namespace std;
int main(){
    int N;
    long long int H;
    scanf("%d%lld", &N, &H);
    long long int S[N+1];
    for(int i=1;i<N+1;i++){
        scanf("%lld", &S[i]);
    }
    multiset<long long int> pointsL;
    multiset<long long int> pointsR;
    pointsL.insert(-1);
    pointsR.insert(1000000001);
    long long int ans=0;
    for(int i=1;i<N+1;i++){
        if(S[i]<*(--pointsL.end())-H*i){
            pointsL.insert(S[i]+H*i);
            pointsL.insert(S[i]+H*i);
            pointsR.insert((*(--pointsL.end()))-2*H*i);
            pointsL.erase(--pointsL.end());
            ans+=(*pointsR.begin())+H*i-S[i];
        }
        else if(S[i]>*pointsR.begin()+H*i){
            pointsR.insert(S[i]-H*i);
            pointsR.insert(S[i]-H*i);
            pointsL.insert((*pointsR.begin())+2*H*i);
            pointsR.erase(pointsR.begin());
            ans+=S[i]-(*(--pointsL.end()))+H*i;
        }
        else{
            pointsL.insert(S[i]+H*i);
            pointsR.insert(S[i]-H*i);
        }
    }
    printf("%lld", ans);
    return 0;
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%lld", &N, &H);
     ~~~~~^~~~~~~~~~~~~~~~~~
safety.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &S[i]);
         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29