题目

Solution

a [ i ] a[i] a[i]等价于 a [ i ] + i a[i]+i a[i]+i，若有数重复出现，则是 S a d Sad Sad，否则是 H a p p y Happy Happy

Code

#include<bits/stdc++.h> using namespace std; int i,x,n; map<int,int>mp; inline char gc(){ static char buf[100000],*p1=buf,*p2=buf; return p1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++; } inline int rd(){ int x=0,fl=1;char ch=gc(); for (;ch<48||ch>57;ch=gc())if(ch=='-')fl=-1; for (;48<=ch&&ch<=57;ch=gc())x=(x<<3)+(x<<1)+(ch^48); return x*fl; } int main(){ n=rd(); for (i=0;i<n;i++){ x=rd()+i; if (mp[x]++) return puts("Sad"),0; } puts("Happy"); }