D -design-easy
Crawling in process...
Crawling failed
Time Limit:
3000MS
Memory Limit:
0KB
64bit IO Format:
%lld & %llu
Description

Problem C - Sumsets
Given S, a set of integers, find the largest d such that a + b + c = d where a, b, c, and d are distinct elements of S.Input
Several S, each consisting of a line containing an integer 1 <= n <= 1000 indicating the number of elements in S, followed by the elements of S, one per line. Each element of S is a distinct integer between -536870912 and +536870911 inclusive. The last line of input contains 0.Output
For each S, a single line containing d, or a single line containing "no solution".Sample Input
5 2 3 5 7 12 5 2 16 64 256 1024 0
Output for Sample Input
12 no solution
真是好题啊,这题让我明白了一个道理,qsort才是真正的快排。用sor果断TLE,qsort果断AC。
#include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
int m;
int z[1000+10];
/*
int cmp(int a1,int b1)
{
return a1<b1;
}
*/
int cmp(const void*a,const void*b)
{
int *c=(int*)a;
int *d=(int*)b;
return *d-*c;
}
int main()
{
while(scanf("%d",&m),m)
{
memset(z,0,sizeof(z));
for(int a=0;a<m;a++)
scanf("%d",&z[a]);
qsort(z,m,sizeof(int),cmp);
int flag=0;
for(int l=0;l<m;l++)
{
for(int i=0;i<m;i++)
{
if(i==l)continue;
for(int j=0;j<m;j++)
{
if(j==i||j==l)continue;
for(int k=0;k<m;k++)
{
if(k==l||k==i||k==j)continue;
if(z[l]==z[i]+z[j]+z[k])
{flag=1;printf("%d\n",z[l]);break;}
}
if(flag)break;
}
if(flag)break;
}
if(flag)break;
}
if(!flag)printf("no solution\n");
}
return 0;
}