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Submission #13360

# Submission time Handle Problem Language Result Execution time Memory
13360 2015-02-13T16:56:00 Z gs14004 Watching (JOI13_watching) C++14
50 / 100
 4 ms 2240 KB 
#include <cstdio>
#include <algorithm>
#include <cstring>
using namespace std;

int n,p,q,a[2005];
int nxt[2005], nxt2[2005];

char dp[105][105][105];

bool f(int x, int y, int z){
    if(y == -1 || z == -1) return 0;
    if(x == n) return 1;
    if(~dp[x][y][z]) return dp[x][y][z];
    return dp[x][y][z] = f(nxt[x],y-1,z) || f(nxt2[x],y,z-1);
}

bool trial(int x){
    for (int i=0; i<n; i++) {
        nxt[i] = (int)(lower_bound(a,a+n,a[i]+x) - a);
        nxt2[i] = (int)(lower_bound(a,a+n,a[i]+2*x) - a);
    }
    memset(dp,-1,sizeof(dp));
    return f(0,p,q);
}

int main(){
    scanf("%d %d %d",&n,&p,&q);
    for (int i=0; i<n; i++) {
        scanf("%d",&a[i]);
    }
    p = min(p,n);
    q = min(q,n);
    sort(a,a+n);
    int s = 0, e = 5e8;
    while (s != e) {
        int m = (s+e)/2;
        if(trial(m)) e = m;
        else s = m+1;
    }
    printf("%d",s);
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2240 KB Output is correct
2 Correct 3 ms 2240 KB Output is correct
3 Correct 3 ms 2240 KB Output is correct
4 Correct 3 ms 2240 KB Output is correct
5 Correct 3 ms 2240 KB Output is correct
6 Correct 3 ms 2240 KB Output is correct
7 Correct 3 ms 2240 KB Output is correct
8 Correct 3 ms 2240 KB Output is correct
9 Correct 3 ms 2240 KB Output is correct
10 Correct 4 ms 2240 KB Output is correct
11 Correct 4 ms 2240 KB Output is correct
12 Correct 3 ms 2240 KB Output is correct
13 Correct 3 ms 2240 KB Output is correct
14 Correct 3 ms 2240 KB Output is correct
15 Correct 3 ms 2240 KB Output is correct

Subtask #2
0.0 / 50.0

# Verdict Execution time Memory Grader output
1 Runtime error 0 ms 2236 KB SIGSEGV Segmentation fault
2 Halted 0 ms 0 KB -