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Submission #8095

# Submission time Handle Problem Language Result Execution time Memory
8095 2014-08-29T16:35:50 Z gs14004 전봇대 (KOI13_pole) C++
89 / 100
 60 ms 2648 KB 
#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long lint;

struct pole{lint a,i;}d[100005];
int cmp(pole a, pole b){return a.a * b.i < b.a * a.i;}

lint n;
lint trial(lint piv){
    lint res = 0;
    for (int i=0; i<n; i++) {
        res += max(d[i].a - piv * d[i].i, piv * d[i].i - d[i].a);
    }
    return res;
}

int main(){
    scanf("%lld",&n);
    for (int i=0; i<n; i++) {
        scanf("%lld",&d[i].a);
        d[i].i = i;
    }
    sort(d,d+n,cmp);
    int piv;
    lint cum = 0;
    for (piv = 0; piv < n; piv++) {
        cum += d[piv].i;
        if(cum >= n * (n-1) / 4) break;
    }
    lint that = d[piv].a / d[piv].i;
    lint res = 1e16;
    for (lint t = that-2; t <= that+2; t++) {
        if(t > 0)res = min(res,trial(t));
    }
    printf("%lld",res);
}

Subtask #1
0.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2648 KB Output is correct
2 Correct 0 ms 2648 KB Output is correct
3 Incorrect 0 ms 2648 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2648 KB Output is correct
2 Correct 0 ms 2648 KB Output is correct
3 Correct 0 ms 2648 KB Output is correct
4 Correct 0 ms 2648 KB Output is correct
5 Correct 0 ms 2648 KB Output is correct
6 Correct 0 ms 2648 KB Output is correct
7 Correct 0 ms 2648 KB Output is correct
8 Correct 0 ms 2648 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2648 KB Output is correct
2 Correct 0 ms 2648 KB Output is correct
3 Correct 4 ms 2648 KB Output is correct
4 Correct 4 ms 2648 KB Output is correct
5 Correct 4 ms 2648 KB Output is correct
6 Correct 4 ms 2648 KB Output is correct

Subtask #4
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 2648 KB Output is correct
2 Correct 56 ms 2648 KB Output is correct
3 Correct 48 ms 2648 KB Output is correct
4 Correct 60 ms 2648 KB Output is correct
5 Correct 48 ms 2648 KB Output is correct
6 Correct 56 ms 2648 KB Output is correct