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Submission #1086150

# Submission time Handle Problem Language Result Execution time Memory
1086150 2024-09-09T15:59:15 Z duytuandao21 Po (COCI21_po) C++17
60 / 70
 15 ms 3276 KB 
#include<bits/stdc++.h>
using namespace std;

const int N = 2e5 + 7;
const int inf = 1e9 + 7;
const long long infll = 1e18 + 7;

int n;
int a[N], posMin[N], prePos[N];
pair<int, int> b[N];
int main() 
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        b[i] = make_pair(a[i], i);
    }
    sort (b + 1, b + 1 + n);
    int cnt = 0;
    b[0].first = -1;
    for (int i = 1; i <= n; i++) {
        if (b[i].first != b[i - 1].first) cnt++;
        a[b[i].second] = cnt;
    }
    stack <int> st;
    for (int i = 1; i <= n; i++) {
        while (st.size() > 0 && a[i] <= a[st.top()]) st.pop();
        if (st.size() > 0) posMin[i] = st.top();
        st.push(i);
    }
    int res = 0;
    for (int i = 1; i <= n; i++) {
        if (prePos[a[i]] == 0) res++;
        else {
            if (posMin[i] > prePos[a[i]] && prePos[a[i]] > 1) res++;
        }
        prePos[a[i]] = i;
    }
    cout << res;
    return 0;
}

Subtask #1
60.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 7 ms 1248 KB Output is correct
5 Correct 10 ms 1624 KB Output is correct
6 Correct 15 ms 3276 KB Output is correct
7 Incorrect 9 ms 3164 KB Output isn't correct