Submission #1036920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036920		ZeroCool	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	348 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ll long long
#define ar array
#define ld long double
 
const int N = 100;
const int X = 10005;
const int B = 400;
const int M = 200;
const int INF = 1e15;
const int LOG = 63;
const int MOD = 1e9 + 7;
 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,bmi,bmi2,lzcnt,popcnt")

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int f(int h,int w){
	int a = h * (h + 1) / 2;
	int b = w * (w + 1) / 2;
	return (a * b) % MOD;
}

stack<ar<int, 2> > s;

int ans;

void push(int h,int w){
	int sum = 0;
	
	while(s.size() && s.top()[0] > h){
		sum += s.top()[1];
		sum %= MOD;
		ans += f(sum, s.top()[0]);
		ans -= f(sum - s.top()[1], s.top()[0]);
		ans = (ans % MOD + MOD) % MOD;
		s.pop();
	}
	ans -= f(sum, h);
	ans = (ans % MOD + MOD) % MOD;
	s.push(ar<int, 2>{h, sum + w});
}

signed main(){ios_base::sync_with_stdio(false);cin.tie(0);
	int n;
	cin>>n;
	
	while(n--){
		int h, w;
		cin>>h>>w;
		push(h, w);
	}
	push(0, 0);
	cout<<ans;
	
}
 

• 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