oj.uz

Submission #805651

# Submission time Handle Problem Language Result Execution time Memory
805651 2023-08-03T19:29:16 Z jcelin Fancy Fence (CEOI20_fancyfence) C++14
12 / 100
 1 ms 340 KB 
#include <bits/stdc++.h>
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;

#define ii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define vpll vector<pll>
#define msi multiset<int>
#define si set<int>
#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define FOR(i, a, b) for (int i = int(a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()

const int mod = 1e9 + 7;
const int MOD = 998244353;
const int inf = mod;
const ll INF = 1e18;
const int MAXN = 1e6 + 7;
const int logo = 17;
const int off = 1 << logo;
const int trsz = off << 1;
const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, 1, -1};


vpll st;
int ans, n, in2;

ll pf[MAXN], w[MAXN], h[MAXN], dp[MAXN];

int add(ll a, ll b){
	return (a + b) % mod;
}

int mul(ll a, ll b){
	return (a * b) % mod;
}

int sub(ll a, ll b){
	return (a - b + mod) % mod;
}

int exp(int b, ll e){
	int ret = 1;
	while(e){
		if(e & 1) ret = mul(ret, b);
		b = mul(b, b);
		e /= 2;
	}
	return ret;
}

int ch2(ll a){
	return mul(in2, mul(a, a + 1));
}

void solve(){
	cin >> n;
	in2 = exp(2, mod - 2);
	for(int i=1; i<=n; i++) cin >> h[i];
	for(int i=1; i<=n; i++) cin >> w[i], pf[i] = add(pf[i - 1], w[i]);
	st.PB({0, 0});
	for(int i=1; i<=n; i++){
		while(h[st.back().X] > h[i]) st.PPB();
		ll su = mul(add(st.back().Y, mul(ch2(h[i]), sub(pf[i - 1], pf[st.back().X]))), w[i]);
		dp[i] = add(su, mul(ch2(h[i]), ch2(w[i])));
		st.PB({i, add(su, mul(ch2(h[i]), w[i]))});
		ans = add(ans, dp[i]);
	}
	cout << ans << "\n";
}


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int t=1;
	//cin >> t;
	while(t--)solve();
	return 0;
}

Subtask #1
0.0 / 0.0

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

Subtask #2
12.0 / 12.0

# 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 0 ms 340 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
0 / 13.0

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

Subtask #4
0 / 15.0

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

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

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