답안 #581757

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
581757	2022-06-23T05:50:18 Z	조영욱(#8367)	Sparklers (JOI17_sparklers)	C++17	0 / 100	8 ms	4220 KB

sparklers

#include <bits/stdc++.h>
using namespace std;

int n,k,t;
long long arr[100000];
int dp[1000][1000];
long long s;

int ans(int l,int r) {
    if (l==0&&r==n-1) {
        return 1;
    }
    if (dp[l][r]!=-1) {
        return dp[l][r];
    }
    long long val=2*s*t*(r-l+1);
    val-=arr[r]-arr[l];
    int ret=0;
    if (l!=0&&val>=arr[l]-arr[l-1]){
        ret|=ans(l-1,r);
    }
    if (r!=n-1&&val>=arr[r+1]-arr[r]) {
        ret|=ans(l,r+1);
    }
    return dp[l][r]=ret;
}

bool isp(long long x) {
    s=x;
    memset(dp,-1,sizeof(dp));
    return ans(k,k);
}

int main(void) {
    scanf("%d %d %d",&n,&k,&t);
    k--;
    for(int i=0;i<n;i++){
        scanf("%lld",&arr[i]);
    }
    long long lo=0;
    long long hi=1e9; //possible
    while (lo+1<hi) {
        long long mid=(lo+hi)/2;
        if (isp(mid)) {
            hi=mid;
        }
        else {
            lo=mid;
        }
    }
    printf("%lld",hi);
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     scanf("%d %d %d",&n,&k,&t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         scanf("%lld",&arr[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	4180 KB	Output is correct
2	Correct	8 ms	4180 KB	Output is correct
3	Correct	7 ms	4212 KB	Output is correct
4	Correct	6 ms	4180 KB	Output is correct
5	Correct	6 ms	4180 KB	Output is correct
6	Correct	6 ms	4216 KB	Output is correct
7	Correct	7 ms	4180 KB	Output is correct
8	Correct	6 ms	4180 KB	Output is correct
9	Correct	6 ms	4180 KB	Output is correct
10	Correct	5 ms	4180 KB	Output is correct
11	Correct	5 ms	4180 KB	Output is correct
12	Correct	7 ms	4180 KB	Output is correct
13	Correct	6 ms	4180 KB	Output is correct
14	Correct	5 ms	4180 KB	Output is correct
15	Correct	6 ms	4180 KB	Output is correct
16	Correct	6 ms	4180 KB	Output is correct
17	Correct	7 ms	4220 KB	Output is correct
18	Correct	8 ms	4100 KB	Output is correct
19	Incorrect	5 ms	4180 KB	Output isn't correct
20	Halted	0 ms	0 KB	-

Subtask #2

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	4180 KB	Output is correct
2	Correct	8 ms	4180 KB	Output is correct
3	Correct	7 ms	4212 KB	Output is correct
4	Correct	6 ms	4180 KB	Output is correct
5	Correct	6 ms	4180 KB	Output is correct
6	Correct	6 ms	4216 KB	Output is correct
7	Correct	7 ms	4180 KB	Output is correct
8	Correct	6 ms	4180 KB	Output is correct
9	Correct	6 ms	4180 KB	Output is correct
10	Correct	5 ms	4180 KB	Output is correct
11	Correct	5 ms	4180 KB	Output is correct
12	Correct	7 ms	4180 KB	Output is correct
13	Correct	6 ms	4180 KB	Output is correct
14	Correct	5 ms	4180 KB	Output is correct
15	Correct	6 ms	4180 KB	Output is correct
16	Correct	6 ms	4180 KB	Output is correct
17	Correct	7 ms	4220 KB	Output is correct
18	Correct	8 ms	4100 KB	Output is correct
19	Incorrect	5 ms	4180 KB	Output isn't correct
20	Halted	0 ms	0 KB	-

Subtask #3

0 / 50.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	4180 KB	Output is correct
2	Correct	8 ms	4180 KB	Output is correct
3	Correct	7 ms	4212 KB	Output is correct
4	Correct	6 ms	4180 KB	Output is correct
5	Correct	6 ms	4180 KB	Output is correct
6	Correct	6 ms	4216 KB	Output is correct
7	Correct	7 ms	4180 KB	Output is correct
8	Correct	6 ms	4180 KB	Output is correct
9	Correct	6 ms	4180 KB	Output is correct
10	Correct	5 ms	4180 KB	Output is correct
11	Correct	5 ms	4180 KB	Output is correct
12	Correct	7 ms	4180 KB	Output is correct
13	Correct	6 ms	4180 KB	Output is correct
14	Correct	5 ms	4180 KB	Output is correct
15	Correct	6 ms	4180 KB	Output is correct
16	Correct	6 ms	4180 KB	Output is correct
17	Correct	7 ms	4220 KB	Output is correct
18	Correct	8 ms	4100 KB	Output is correct
19	Incorrect	5 ms	4180 KB	Output isn't correct
20	Halted	0 ms	0 KB	-