oj.uz

Submission #528281

# Submission time Handle Problem Language Result Execution time Memory
528281 2022-02-19T19:14:35 Z Olympia Fancy Fence (CEOI20_fancyfence) C++17
12 / 100
 6 ms 332 KB 
#include <cmath>
#include <cassert>
#include <iostream>
#include <set>
#include <climits>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <type_traits>
#include <string>
#include <queue>
#include <map>
#include <stack>

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC optimization ("Ofast")
using namespace std;
const int MOD = 1e9 + 7;
int64_t mult (int64_t x, int64_t y) {
    return (x * y) % MOD;
}
int64_t c2 (int64_t x) {
    return (x * (x + 1)/2) % MOD;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int N;
    cin >> N;
    vector<int64_t> h(N), w(N);
    vector<pair<int64_t, int64_t>> grid(N);
    set<int> s;
    for (int i = 0; i < N; i++) {
        cin >> h[i];
        s.insert(h[i]);
    }
    vector<int64_t> pref = {0};
    for (int i = 0; i < N; i++) {
        cin >> w[i];
        pref.push_back(pref.back() + w[i]);
    }
    for (int i = 0; i < N; i++) {
        grid[i] = make_pair(w[i], h[i]);
    }
    int64_t ans = 0;
    for (int64_t x: s) {
        for (int i = 0; i < N; i++) {
            if (h[i] == x) {
                int l = i;
                while (l >= 1) {
                    if (h[l - 1] >= x) {
                        l--;
                    } else {
                        break;
                    }
                }
                int r = i;
                while (r < N - 1) {
                    if (h[r + 1] > x) {
                        r++;
                    } else {
                        break;
                    }
                }
                int64_t sum = ((pref[i] - pref[l])) % MOD * ((pref[r + 1] - pref[i + 1])) % MOD;
                sum %= MOD;
                sum += (pref[r + 1] - pref[l] - w[i]) * w[i];
                sum %= MOD;
                ans += mult(sum, c2(x));
                ans %= MOD;
            }
        }
    }
    for (int i = 0; i < N; i++) {
        ans += mult(c2(grid[i].first), c2(grid[i].second));
        ans %= MOD;
    }
    cout << ans << '\n';
    return 0;
    ans = 0;
    for (int i = 0; i < N; i++) {
        ans += mult(c2(grid[i].first), c2(grid[i].second));
        ans %= MOD;
        int64_t min_w = grid[i].second;
        for (int j = i + 1; j < N; j++) {
            min_w = min(min_w, grid[j].second);
            ans += mult(c2(min_w), mult(grid[i].first, grid[j].first));
            ans %= MOD;
        }
    }
    cout << ans << '\n';
}

Compilation message

fancyfence.cpp:16: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   16 | #pragma GCC optimization ("O3")
      | 
fancyfence.cpp:17: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   17 | #pragma GCC optimization ("unroll-loops")
      | 
fancyfence.cpp:18: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   18 | #pragma GCC optimization ("Ofast")
      |

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Incorrect 6 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 204 KB Output is correct
2 Correct 2 ms 204 KB Output is correct
3 Correct 1 ms 236 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Incorrect 3 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 204 KB Output is correct
2 Incorrect 2 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 2 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Incorrect 6 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -