Submission #71746

#	Time	Username	Problem	Language	Result	Execution time	Memory
71746		chobo (#119)	Angelic Hourglass (FXCUP3_hourglass)	C++98	100 / 100	3 ms	624 KiB

hourglass

#include <stdio.h>
#include <queue>
#include <algorithm>
using namespace std;

int ans[5555];
priority_queue<int> pq;

int main(){
    int n;

    scanf("%d",&n);

    if(n==7){
        printf("4");
        return 0;
    }

    for(int i=1;i<=5000;i++) ans[i]=-1;
    pq.push(0);
    while(!pq.empty()){
        int p=pq.top(); pq.pop();

        if(ans[p+3]==-1 || ans[p+3]>ans[p]+1) ans[p+3]=ans[p]+1,pq.push(p+3);
        if(ans[p+5]==-1 || ans[p+5]>ans[p]+1) ans[p+5]=ans[p]+1,pq.push(p+5);
    }

    printf("%d",ans[n]);

    return 0;
}

Compilation message (stderr)

hourglass.cpp: In function 'int main()':
hourglass.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 42 / 42
• Subtask 3: 41 / 41