Submission #438996

#	Time	Username	Problem	Language	Result	Execution time	Memory
438996		Hausdorf	Mountains (NOI20_mountains)	C++17	64 / 100	2098 ms	10436 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define itn int
#define fi first
#define se second
#pragma optimizatiob ("O3")
#pragma GCC target ("avx2")
#pragma optimization ("unroll_loops")

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n; cin >> n;
    vector<ll> h(n + 2);
    for (int i = 1; i <= n; ++i)
        cin >> h[i];
    h[0] = h[n + 1] = -2e9;
    vector<int> lessleft(n + 2, 0), lessright(n + 2, 0);
    //lessleft[0] = -1; lessright[n + 1] = -1;
    lessleft[1] = lessright[n] = 0;
    for (int i = 2; i <= n; ++i) {
        for (int j = 1; j < i; ++j) {
            if (h[j] < h[i])
                ++lessleft[i];
        }
    }
    for (int i = n - 1; i >= 1; --i) {
        for (int j = n; j > i; --j) {
            if (h[j] < h[i])
                ++lessright[i];
        }
    }
    ll ans = 0;
    for (int i = 1; i <= n; ++i)
        ans += 1ll * lessleft[i] * lessright[i];
    cout << ans;
}

Compilation message (stderr)

Mountains.cpp:8: warning: ignoring '#pragma optimizatiob ' [-Wunknown-pragmas]
    8 | #pragma optimizatiob ("O3")
      | 
Mountains.cpp:10: warning: ignoring '#pragma optimization ' [-Wunknown-pragmas]
   10 | #pragma optimization ("unroll_loops")
      |

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 36 / 36
• Subtask 5: 28 / 28
• Subtask 6: 0 / 9
• Subtask 7: 0 / 12