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Submission #1119439

# Submission time Handle Problem Language Result Execution time Memory
1119439 2024-11-27T03:45:44 Z TrieTr Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 32 ms 4580 KB 
#include<bits/stdc++.h>
using namespace std;

void local() {
    #define taskname ""
    if (fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
}

#define ll long long
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

template<class X, class Y> bool mini(X &a, const Y &b) {return (a > b) ? a = b, true : false;}
template<class X, class Y> bool maxi(X &a, const Y &b) {return (a < b) ? a = b, true : false;}

const int N = 1e6 + 5;
const int mod = 1e9 + 7;
void add(int& x, int y) {
    if((x += y) >= mod) x -= mod;
}
void sub(int& x, int y) {
    if((x -= y) < 0) x += mod;
}
int hieu(int x, int y) {
    sub(x, y); return x;
}

int n, h[N], w[N], dp[N], ri[N], pf[N];

int inv2 = 5e8 + 4;
int cal(int x) {
    return 1ll * x * (x + 1) % mod * inv2 % mod;
}

int main() {
    fastio; local();
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> h[i];
    for(int i = 1 ;i <= n; i++) cin >> w[i];
    for(int i = 1; i <= n; i++) pf[i] = pf[i - 1], add(pf[i], w[i]);
    stack<int> st;
    for(int i = n; i > 0; i--) {
        while(!st.empty() && h[st.top()] >= h[i]) st.pop();
        ri[i] = st.empty() ? n + 1 : st.top();
        st.emplace(i);
    }
    int res = 0;
    for(int i = n; i > 0; i--) {
        add(res, 1ll * cal(w[i]) * cal(h[i]) % mod);
        add(res, 1ll * hieu(pf[ri[i] - 1], pf[i]) % mod * w[i] % mod * cal(h[i]) % mod);
        add(res, 1ll * dp[ri[i]] * w[i] % mod);
        add(dp[i], dp[ri[i]]);
        add(dp[i], 1ll * hieu(pf[ri[i] - 1], pf[i - 1]) % mod * cal(h[i]) % mod);
    }
    cout << res;
}

Compilation message

fancyfence.cpp: In function 'void local()':
fancyfence.cpp:7:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:8:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 9 ms 1872 KB Output is correct
4 Correct 19 ms 3408 KB Output is correct
5 Correct 18 ms 3408 KB Output is correct
6 Correct 19 ms 3712 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 3 ms 720 KB Output is correct
3 Correct 11 ms 2392 KB Output is correct
4 Correct 29 ms 4176 KB Output is correct
5 Correct 23 ms 4512 KB Output is correct
6 Correct 1 ms 336 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 3 ms 700 KB Output is correct
4 Correct 11 ms 2316 KB Output is correct
5 Correct 25 ms 4268 KB Output is correct
6 Correct 20 ms 4444 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 3 ms 848 KB Output is correct
9 Correct 13 ms 2268 KB Output is correct
10 Correct 20 ms 4188 KB Output is correct
11 Correct 25 ms 4176 KB Output is correct
12 Correct 1 ms 336 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 484 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 696 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 504 KB Output is correct
11 Correct 8 ms 1916 KB Output is correct
12 Correct 16 ms 3404 KB Output is correct
13 Correct 19 ms 3564 KB Output is correct
14 Correct 20 ms 3412 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 3 ms 852 KB Output is correct
17 Correct 13 ms 2284 KB Output is correct
18 Correct 20 ms 4180 KB Output is correct
19 Correct 25 ms 4428 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 3 ms 852 KB Output is correct
22 Correct 13 ms 2432 KB Output is correct
23 Correct 25 ms 4228 KB Output is correct
24 Correct 23 ms 4180 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 4 ms 852 KB Output is correct
31 Correct 3 ms 864 KB Output is correct
32 Correct 10 ms 2144 KB Output is correct
33 Correct 11 ms 2404 KB Output is correct
34 Correct 20 ms 4192 KB Output is correct
35 Correct 22 ms 4088 KB Output is correct
36 Correct 22 ms 4348 KB Output is correct
37 Correct 27 ms 4180 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 26 ms 4368 KB Output is correct
40 Correct 32 ms 4180 KB Output is correct
41 Correct 22 ms 4240 KB Output is correct
42 Correct 21 ms 4580 KB Output is correct