Submission #338028

#	Time	Username	Problem	Language	Result	Execution time	Memory
338028		BeanZ	Divide and conquer (IZhO14_divide)	C++14	100 / 100	36 ms	3436 KiB

divide

// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 1e5 + 50;
long long mod = 1e9 + 7;
const int lim = 700;
const int lg = 18;
const int base = 311;
const long double eps = 1e-6;
ll sume[N], sumg[N], mn[N];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n;
    cin >> n;
    mn[0] = 1e18;
    ll ans = 0;
    for (int i = 1; i <= n; i++){
        ll x, g, d;
        cin >> x >> g >> d;
        ll l = 1, h = i - 1;
        sume[i] = sume[i - 1] + d;
        sumg[i] = sumg[i - 1] + g;
        ll cost = sume[i] - x;
        while (l <= h){
            ll mid = (l + h) >> 1;
            if (mn[mid] > cost){
                l = mid + 1;
            } else {
                h = mid - 1;
            }
        }
        ans = max(ans, sumg[i] - sumg[l - 1]);
        mn[i] = min(mn[i - 1], sume[i - 1] - x);
        //cout << mn[i] << " " << cost << endl;
    }
    cout << ans;
}
/*
Ans:

Out:
*/

Compilation message (stderr)

divide.cpp: In function 'int main()':
divide.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   17 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   18 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52