【水hash】#22 A. Second Order Statistics
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5min内秒掉的题呢^_^~~~
感觉良好~但是学不到东西……
用pair似乎比较省内存,但是才100,我就直接上hash表了
#include<cstdio>#include<string>#include<cstring>#include<iostream>#include<algorithm>using namespace std;int mark[201]; int main(){int n=0;scanf("%d",&n);memset(mark,0,sizeof(mark));for(int i=1;i<=n;i++){int now=0;scanf("%d",&now);mark[now+100]=1;}int flag=0;for(int j=0;j<=200;j++){if(flag==1&&mark[j]==1){printf("%d",j-100); return 0;}if(flag==0&&mark[j]==1) flag=1;}printf("NO");return 0;}
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