Submission #1814839


Source Code Expand

#include <bits/stdc++.h>

using namespace std;

long long n, a[200005], pos[200005], it[800005], tmp;

void update(long long k, long long l, long long r, long long i){
    if(l > i || r < i) return;
    if(l == r){
        it[k] = min(it[k], a[i]);
        return;
    }
    long long m = (l + r) / 2;
    update(2 * k, l, m, i);
    update(2 * k + 1, m + 1, r, i);
    it[k] = min(it[2 * k], it[2 * k + 1]);
}

void get(long long k, long long l, long long r, long long u, long long v){
    if(l > v || r < u) return;
    if(u <= l && r <= v){
        tmp = min(tmp, it[k]);
        return;
    }
    long long m = (l + r) / 2;
    get(2 * k, l, m, u, v);
    get(2 * k + 1,m + 1, r, u, v);
}

long long tinh(long long x, long long y){
    if(x > y) return 0;
    if(x == y) return a[x];
    tmp = LONG_LONG_MAX;
    get(1, 1, n, x, y);
    long long vt = pos[tmp];
    long long kq = ((vt - x) * (y - vt) + (vt  - x) + (y - vt) + 1) * tmp;
    return kq + tinh(x, vt - 1) + tinh(vt + 1, y);
}

int main()
{
    cin >> n;
    for(long long i = 1; i <= 4 * n; i++) it[i] = LONG_LONG_MAX;
    for(long long i = 1; i <= n; i++){
        cin >> a[i];
        pos[a[i]] = i;
        update(1, 1, n, i);
    }
    cout << tinh(1, n);
}

Submission Info

Submission Time
Task B - Minimum Sum
User vjudge2
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1230 Byte
Status AC
Exec Time 129 ms
Memory 18944 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 13
Set Name Test Cases
Sample example0, example1, example2
All corner0, corner1, corner2, corner3, example0, example1, example2, maxrand0, maxrand1, maxrand2, rand0, rand1, rand2
Case Name Status Exec Time Memory
corner0 AC 107 ms 9600 KB
corner1 AC 116 ms 18944 KB
corner2 AC 2 ms 2304 KB
corner3 AC 129 ms 14336 KB
example0 AC 2 ms 2304 KB
example1 AC 2 ms 2304 KB
example2 AC 2 ms 2304 KB
maxrand0 AC 126 ms 9600 KB
maxrand1 AC 113 ms 9600 KB
maxrand2 AC 112 ms 9600 KB
rand0 AC 2 ms 2304 KB
rand1 AC 2 ms 2304 KB
rand2 AC 2 ms 2304 KB