Submission #13127

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
13127	2015-01-31 12:54:43	gs14004	Divide and conquer (IZhO14_divide)	C++14	100 / 100	63 ms	4208 KiB

divide

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#include <cstdio>
#include <algorithm>
using namespace std;
int n;
long long x[100005], g[100005], d[100005], p[100005];
int main(){
    scanf("%d",&n);
    for (int i=1; i<=n; i++) {
        scanf("%lld %lld %lld",&x[i],&g[i],&d[i]);
        d[i] += d[i-1];
        g[i] += g[i-1];
        p[i] = d[i] - x[i];
    }
    for (int i=n-1; i; i--) {
        p[i] = max(p[i],p[i+1]);
    }
    long long r = 0;
    for (int i=1; i<=n; i++) {
        int s = i, e = n;
        while (s != e) {
            int m = (s+e+1)/2;
            if(d[i-1] - x[i] <= p[m]) s = m;
            else e = m-1;
        }
        if(d[i-1] - x[i] <= p[s]){
            r = max(r,g[s] - g[i-1]);
        }
    }
 
 
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• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52