Submission #30742

#	Time	Username	Problem	Language	Result	Execution time	Memory
30742		inqr	Gap (APIO16_gap)	C++14	30 / 100	2000 ms	5800 KiB

gap

#include "gap.h"
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define rt insert
#define st first
#define nd second
#define ll long long
#define pii pair < int , int >
#define DB printf("debug\n");
#define umax( x , y ) x = max( x , y )
#define umin( x , y ) x = min( x , y )
#define all(x) x.begin() , x.end()
using namespace std;
long long findGap(int T, int N)
{
	if(T==1){
		long long a[N];memset(a,0,sizeof(a));
		int l=0,r=N-1;
		while(l<=r){
			if(l==0 && r==N-1){
				MinMax(0,1e18,&a[l],&a[r]);
			}
			else{
				//printf("l=%d r=%d\n",l,r);
				MinMax(a[l-1]+1,a[r+1]-1,&a[l],&a[r]);	
				//else MinMax(a[l-1]+1,1e18,&a[l],NULL);
			}
			l++,r--;
		}
		long long ans=0;
		for(int i=0;i<N-1;i++){
			//printf("i=%d a[i]=%lld a[i+1]=%lld\n",i,a[i],a[i+1]);
			umax(ans,a[i+1]-a[i]);
		}
		return ans;
	}
	else if(T==2){
		ll a[N];memset(a,0,sizeof(a));
		int l=0,r=N-1;
		ll ans;
		MinMax(0,1e18,&a[l],&a[r]);l++,r--;
		MinMax(a[l-1]+1,a[r+1]-1,&a[l],&a[r]);l++,r--;
		umax(ans,max(a[1]-a[0],a[N-1]-a[N-2]));
		while(l<=r){
			ll x,y;
			MinMax(a[l-1]+1,a[l-1]+1+ans,&x,&y);
			if(x==-1&&y==-1){
				ans++;
			}
			else{
				a[l]=x;
				umax(ans,x-a[l-1]);
				l++;
			}
		}
		for(int i=0;i<N-1;i++){
			//printf("i=%d a[i]=%lld a[i+1]=%lld\n",i,a[i],a[i+1]);
			umax(ans,a[i+1]-a[i]);
		}
		return ans;
	}
	return 0;
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:41:6: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ll ans;
      ^

• Subtask 1: 30 / 30
• Subtask 2: 0 / 70