oj.uz

Submission #667557

# Submission time Handle Problem Language Result Execution time Memory
667557 2022-12-01T17:17:58 Z mychecksedad Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 31 ms 4296 KB 
/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;

int n, ls[N], rs[N];
ll w[N], h[N], pref[N];

ll comb2(ll x){
    return (x*(x+1)/2) % MOD;
}
ll p(int l, int r){
    if(l > 0)
        return pref[r] - pref[l - 1];
    return pref[r];
}

void solve(){
    cin >> n;
    for(int i = 0; i < n; ++i) cin >> h[i];
    for(int i = 0; i < n; ++i) cin >> w[i];

    pref[0] = w[0];
    for(int i = 1; i < n; ++i) pref[i] = (pref[i - 1] + w[i]) % MOD;

    deque<pair<int, int>> q;

    ls[0] = -1;
    q.pb({h[0], 0});
    for(int i = 1; i < n; ++i){
        while(!q.empty() && q.back().first >= h[i]) q.pop_back();
        if(!q.empty()) ls[i] = q.back().second;
        else ls[i] = -1;
        q.pb({h[i], i});
    }
    q.clear();
    rs[n - 1] = n;
    q.pb({h[n - 1], n - 1});
    for(int i = n - 2; i >= 0; --i){
        while(!q.empty() && q.back().first > h[i]) q.pop_back();
        if(!q.empty()) rs[i] = q.back().second;
        else rs[i] = n;
        q.pb({h[i], i});
    }
    ll ans = 0;
    for(int i = 0; i < n; ++i){
        ll a = (p(ls[i] + 1, i) * p(i, rs[i] - 1) % MOD);
        (ans += (a - comb2(w[i] - 1)) * comb2(h[i])) %= MOD;
    }
    cout << (ans + MOD) % MOD;
}




int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:69:16: warning: unused variable 'aa' [-Wunused-variable]
   69 |     int T = 1, aa;
      |                ^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 11 ms 2004 KB Output is correct
4 Correct 20 ms 4016 KB Output is correct
5 Correct 29 ms 3796 KB Output is correct
6 Correct 29 ms 3528 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 3 ms 724 KB Output is correct
3 Correct 13 ms 2276 KB Output is correct
4 Correct 28 ms 4172 KB Output is correct
5 Correct 26 ms 4172 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 724 KB Output is correct
4 Correct 12 ms 2228 KB Output is correct
5 Correct 25 ms 4176 KB Output is correct
6 Correct 28 ms 4216 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 3 ms 752 KB Output is correct
9 Correct 13 ms 2072 KB Output is correct
10 Correct 24 ms 3952 KB Output is correct
11 Correct 24 ms 4056 KB Output is correct
12 Correct 0 ms 340 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 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 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 340 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 340 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 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 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 340 KB Output is correct
11 Correct 9 ms 2004 KB Output is correct
12 Correct 19 ms 4112 KB Output is correct
13 Correct 19 ms 3796 KB Output is correct
14 Correct 18 ms 3540 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 724 KB Output is correct
17 Correct 12 ms 2260 KB Output is correct
18 Correct 25 ms 4296 KB Output is correct
19 Correct 26 ms 4284 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 3 ms 724 KB Output is correct
22 Correct 18 ms 2132 KB Output is correct
23 Correct 31 ms 3960 KB Output is correct
24 Correct 31 ms 4032 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 0 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 3 ms 596 KB Output is correct
31 Correct 3 ms 596 KB Output is correct
32 Correct 12 ms 1820 KB Output is correct
33 Correct 13 ms 1876 KB Output is correct
34 Correct 23 ms 3412 KB Output is correct
35 Correct 25 ms 3468 KB Output is correct
36 Correct 24 ms 3392 KB Output is correct
37 Correct 23 ms 3412 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 22 ms 3412 KB Output is correct
40 Correct 23 ms 3436 KB Output is correct
41 Correct 22 ms 3468 KB Output is correct
42 Correct 23 ms 3864 KB Output is correct