Submission #1173490

#	Time	Username	Problem	Language	Result	Execution time	Memory
1173490		Mansurt	Fountain (eJOI20_fountain)	C++20	30 / 100	1593 ms	3128 KiB

fountain

#include <bits/stdc++.h>
#define ll long long
const ll N = 2*1e5+5;
const ll mod = 1e9 + 7;
using namespace std;
ll d[N], c[N], pref[N];
ll mul(ll a, ll b) {
    return (a % mod * b % mod) % mod;
}

ll bpow(ll a, ll b) {
    ll res = 1;
    while (b) {
        if (b & 1) res = mul(res, a);
        a = mul(a, a);
        b >>= 1;
    }
    return res;
}
ll n,q,r,v;
void sub() {
	while(q--) {
    	cin >> r >> v;
    	ll prev = -12;
    	bool fnd = false;
    	for (int i = r; i <= n; i++) {
    		if (d[i] <= prev) continue;
    		v -= c[i];
    		if (v <= 0) {
    			fnd = true;
    			cout << i << '\n';
    			break;
    		}
    		prev = d[i];
    	}
    	if (!fnd) {
    		cout << 0 << '\n';
    	}
    }
} 
void sub2() {
	while(q--) {
    		cin >> r >> v;
    		ll l = r-1, r = n+1;
    		while(r - l > 1) {
    			ll mid = (l+r)/2;
    			if (pref[mid] - pref[l-1] >= v) r = mid;
    			else l = mid;
    		}
    		cout << (r == n + 1 ? 0 : r) << '\n';
    }
}
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> q;
    bool flag = false;
    for (int i = 1; i <= n; i++) {
    	cin >> d[i] >> c[i];
    	pref[i] = pref[i-1] + c[i];
    	if (d[i] >= d[i-1]) flag = true;
    }
    if (flag) sub();
    else sub2();
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40