Submission #170738

#	Time	Username	Problem	Language	Result	Execution time	Memory
170738		juggernaut	Divide and conquer (IZhO14_divide)	C++14	100 / 100	57 ms	8028 KiB

divide

//Just try and the idea will come!
#include<bits/stdc++.h>
#define int long long int
using namespace std;
struct data{
    int x,g,d;
};
data a[100001];
int n,i,drive[100001],gold[100001],vec[100001],res,l,r,m;
main(){
    scanf("%lld",&n);
    for(i=1;i<=n;i++){
        scanf("%lld%lld%lld",&a[i].x,&a[i].g,&a[i].d);
        gold[i]=gold[i-1]+a[i].g;
        drive[i]=drive[i-1]+a[i].d;
        vec[i]=drive[i]-a[i].x;
    }
    for(i=n-1;i>0;i--)vec[i]=max(vec[i],vec[i+1]);
    for(i=1;i<=n;i++){
        l=i;
        r=n;
        while(l<r){
            m=(l+r+1)>>1;
            if(vec[m]>=drive[i-1]-a[i].x)l=m;
            else r=m-1;
        }
        res=max(res,gold[r]-gold[i-1]);
    }
    printf("%lld",res);
}

Compilation message (stderr)

divide.cpp:10:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
divide.cpp: In function 'int main()':
divide.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&n);
     ~~~~~^~~~~~~~~~~
divide.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld%lld",&a[i].x,&a[i].g,&a[i].d);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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