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Submission #650249

# Submission time Handle Problem Language Result Execution time Memory
650249 2022-10-13T08:21:05 Z alvinpiter Fancy Fence (CEOI20_fancyfence) C++17
15 / 100
 89 ms 4796 KB 
#include<bits/stdc++.h>
using namespace std;
#define LL long long int
#define MOD 1000000007
#define MAXN 100000

int n;
LL h[MAXN + 3], w[MAXN + 3], sumWidth[MAXN + 3], sumFhw = 0, ans = 0;
stack<int> st;

LL f(LL k) {
  LL k1 = k + 1;
  return k%2 == 0 ? ((k/2)%MOD * (k1)%MOD)%MOD : (k%MOD * (k1/2)%MOD)%MOD;
}

int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> h[i];
  }

  sumWidth[0] = 0;
  for (int i = 1; i <= n; i++) {
    cin >> w[i];
    sumWidth[i] = sumWidth[i - 1] + w[i];
  }

  for (int i = 1; i <= n; i++) {
    LL rectanglesOnTheCurrentFence = (f(h[i]) * f(w[i]))%MOD;
    ans = (ans + rectanglesOnTheCurrentFence)%MOD;

    while (!st.empty() && h[st.top()] >= h[i]) {
      LL fhw = (f(h[st.top()]) * w[st.top()])%MOD;
      sumFhw = (sumFhw - fhw + MOD)%MOD;

      st.pop();
    }

    int firstLowerIdx = (st.empty() ? 0 : st.top());

    LL rectanglesOnTheCurrentFenceAndTallerNeighbors = 0;
    if (firstLowerIdx != i - 1) {
      rectanglesOnTheCurrentFenceAndTallerNeighbors = (((sumWidth[i - 1] - sumWidth[firstLowerIdx])%MOD * w[i])%MOD * f(h[i]))%MOD;
      ans = (ans + rectanglesOnTheCurrentFenceAndTallerNeighbors)%MOD;
    }

    LL rectanglesOnTheCurrentFenceAndLowerNeighbors = (sumFhw * w[i])%MOD;
    ans = (ans + rectanglesOnTheCurrentFenceAndLowerNeighbors)%MOD;

    st.push(i);
    sumFhw = (sumFhw + (f(h[i]) * w[i])%MOD)%MOD;
  }

  cout << ans << endl;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 224 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 212 KB Output is correct
2 Correct 9 ms 724 KB Output is correct
3 Correct 44 ms 2436 KB Output is correct
4 Correct 89 ms 4556 KB Output is correct
5 Correct 85 ms 4560 KB Output is correct
6 Correct 1 ms 212 KB Output is correct

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 9 ms 724 KB Output is correct
4 Correct 42 ms 2336 KB Output is correct
5 Correct 80 ms 4468 KB Output is correct
6 Correct 80 ms 4660 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 8 ms 696 KB Output is correct
9 Correct 42 ms 2524 KB Output is correct
10 Incorrect 75 ms 4796 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 1 ms 340 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 212 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -