Submission #921754

#	Time	Username	Problem	Language	Result	Execution time	Memory
921754		Alebn	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1059 ms	860 KiB

fancyfence

#include <bits/stdc++.h>
#define int long long
 
using namespace std;
 
const int MOD = 1e9+7, INV = 250000002;
 
int f(int n, int m) {
    return n * m % MOD * (n + 1) % MOD * (m + 1) % MOD * INV % MOD;
}
 
signed main() {
    //input and sum
    int n;
    cin >> n;
    vector<int> h(n), w(n);
    for(int i = 0; i < n; i++) cin >> h[i];
    for(int i = 0; i < n; i++) cin >> w[i];
    //linearily go over and compute result
    int res = 0;
    vector<int> hSorted(n+1);
    for(int i = 0; i < n; i++) hSorted[i+1] = h[i];
    sort(hSorted.begin(), hSorted.end());
    for(int i = 0; i < n+1; i++) {
        int consecutiveW = 0, minH = INT_MAX;
        for(int j = 0; j < n; j++) {
            if(h[j] <= hSorted[i]) {
                //cout << j << " " << hSorted[i] << " " << minH << " " << consecutiveW << "\n";
                res = (res + f(minH, consecutiveW)) % MOD;
                if(i != 0) res = (res - f(hSorted[i], consecutiveW)) % MOD;
                if(res < 0) res = (res + 10000000070000000) % MOD;
                consecutiveW = 0, minH = INT_MAX;
            } else {
                consecutiveW = (consecutiveW + w[j]) % MOD;
                minH = min(minH, h[j]);
            }
        }
        res = (res + f(minH, consecutiveW)) % MOD;
        if(i != 0) res = (res - f(hSorted[i], consecutiveW)) % MOD;
        if(res < 0) res = (res + 10000000070000000) % MOD;
    }
    //cout << h[n-1] << " " << m << "\n";
    cout << res << "\n";
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27