Submission #1122648

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122648		dreamboy	Fountain (eJOI20_fountain)	C++20	60 / 100	1595 ms	2120 KiB

fountain

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
//using namespace __gnu_pbds;

#define speed ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define russian setlocale(LC_ALL,"Russian_Russia.20866");
#define file freopen("onlyone.in", "r", stdin), freopen("onlyone.out", "w", stdout);
#define ll long long
#define big __int128
#define ull unsigned long long
#define ld long double
#define pll pair<ll, ll>
#define pli pair<ll, int>
#define pii pair<int, int>
#define all(s) s.begin(), s.end()
#define pb push_back
#define ins insert
#define sz(x) x.size()
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define mem(x) memset(x, 0, sizeof(x))
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int N = 100010;
const int B = 448;
const ll mod = 1e9 + 7;
const ll P = 263;
const ld pi = acos(-1);
const ll inf = (ll)1e18;
const ll ntr = (ll)-1e18;

ll add(ll a, ll b) {
    if(a + b < 0) return a + b + mod;
    if(a + b >= mod) return a + b - mod;
    return a + b;
}

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

ll mul(ll a, ll b) {
    return a * 1LL * b % mod;
}

ll binpow(ll a, ll n) {
    ll res = 1;
    while(n) {
        if (n & 1) res = mul(res, a);
        a = mul(a, a);
        n >>= 1;
    }
    return res;
}

ll inv(ll x) {
    return binpow(x, mod - 2);
}
int n, q;
int d[N], c[N], p[N];
void solve() {
    cin >> n >> q;
    for(int i = 1; i <= n; i++) {
        cin >> d[i] >> c[i];
        p[i] = p[i - 1] + c[i];
    }
    bool sb2 = true;
    for(int i = 1; i < n; i++) {
        sb2 &= (d[i] < d[i + 1]);
    }
    while(q--) {
        int k, v;
        cin >> k >> v;
        if(sb2) {
            int l = k - 1, r = n + 1;
            while(r > l + 1) {
                int mid = (l + r) / 2;
                if(p[mid] - p[k - 1] >= v) r = mid;
                else l = mid;
            }
            cout << (r == n + 1 ? 0 : r) << '\n';
        }
        else {
            int s = 0, pred = -1, ans = 0;
            for(int i = k; i <= n; i++) {
                if(d[i] > pred) {
                    s += c[i];
                    pred = d[i];
                }
                if(s >= v) {
                    ans = i;
                    break;
                }
            }
            cout << ans << '\n';
        }
    }
}
signed main() {
    speed;
    //file
    int test = 1;
    //cin >> test;
    while(test--) {
        solve();
    }
}

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