Submission #37851

#	Time	Username	Problem	Language	Result	Execution time	Memory
37851		Just_Solve_The_Problem	Divide and conquer (IZhO14_divide)	C++11	100 / 100	79 ms	7484 KiB

divide

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int N = (int)1e5 + 7;
const ll inf = (ll)1e18 + 7;

ll pg[N], pd[N];
ll x[N], g[N], d[N], a[N];
ll suf[N];
ll ans = 0;

main () {
    int n; scanf ("%d", &n);
    for (int i = 1; i <= n; i++) {
        scanf ("%lld %lld %lld", x + i, g + i, d + i);
        pd[i] = pd[i - 1] + d[i];
        pg[i] = pg[i - 1] + g[i];
        a[i] = pd[i] - x[i];
    }
    suf[n + 1] = -inf;
    for (int i = n; i >= 1; i--) {
        suf[i] = max(suf[i + 1], a[i]);
    }
    for (int i = 1; i <= n; i++) {
        int l = i;
        int r = n;
        while (r - l > 1) {
            int mid = (l + r) >> 1;
            if (suf[mid] >= pd[i - 1] - x[i]) {
                l = mid;
            } else {
                r = mid;
            }
        }
        if (suf[r] >= pd[i - 1] - x[i]) {
            l = r;
        }
        ans = max(ans, pg[l] - pg[i - 1]);
    }
    cout << ans;
}

Compilation message (stderr)

divide.cpp:15:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
divide.cpp: In function 'int main()':
divide.cpp:16:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n; scanf ("%d", &n);
                            ^
divide.cpp:18:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%lld %lld %lld", x + i, g + i, d + i);
                                                      ^

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