oj.uz

Submission #581759

# Submission time Handle Problem Language Result Execution time Memory
581759 2022-06-23T05:52:43 Z 반딧불(#8365) Sparklers (JOI17_sparklers) C++17
0 / 100
 1 ms 212 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int n, k;
ll t;
ll arr[100002];

bool able(ll speed){
    speed*=t*2;
    int l = 1, r = n;
    for(int cnt=n-1; cnt>=1; cnt--){
        if(arr[r]-arr[l] > speed*cnt) return false;
        if(arr[r] - arr[r-1] > arr[l+1] - arr[l]) r--;
        else l++;
    }
    return true;
}

int main(){
    scanf("%d %d %lld", &n, &k, &t);
    for(int i=1; i<=n; i++) scanf("%lld", &arr[i]);
    arr[0] = -1e18, arr[n+1] = 1e18;
    if(arr[1] == arr[n]){
        puts("0");
        return 0;
    }

    ll L = 1, R = 1e9, ANS = 1e9;
    while(L<=R){
        ll MID = (L+R)/2;
        if(able(MID)) ANS = MID, R = MID-1;
        else L = MID+1;
    }
    printf("%lld", ANS);
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:23:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     scanf("%d %d %lld", &n, &k, &t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:24:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     for(int i=1; i<=n; i++) scanf("%lld", &arr[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 0 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 0 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 0 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -