Codeforces 653A Bear and Three Balls【水题】
题目链接:
http://codeforces.com/problemset/problem/653/A
题意:
给定序列,找是否存在连续的三个数。
分析:
排序~去重~直接判断~~
代码:
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
const int maxn = 105;
int t[maxn], tt[maxn], vis[1005];
int main (void)
{
int n;cin>>n;
int a = 0;
for(int i = 0; i < n; i++){
cin>>tt[i];
if(vis[tt[i]]) continue;
t[a++] = tt[i];
vis[tt[i]] = 1;
}
sort(t, t + a);
for(int i = 0; i < n - 2; i++){
if(t[i] == t[i + 1] - 1 && t[i + 2] == t[i + 1] + 1){
cout<<"YES"<<endl;
return 0;
}
}
cout<<"NO"<<endl;
return 0;
}
有生之年再一次A没做出来。比赛的时候就是打死也没想到去重这回事,如果做出来了,肯定不至于掉这么多分。。。。真是无语。。。
总结:多试试几组数,不能方!
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