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疯了疯了,怎么总是RE!#include <iostream> using namespace std; #define RSIZE 50000000 #define ASIZE 5000000 int main() { bool rec[RSIZE]; long a[ASIZE]; long i; for (i=0;i<RSIZE;i++) rec[i]=false; for (i=0;i<ASIZE;i++) a[i]=0; a[0]=0; for (i=1;i<ASIZE;i++) { a[i]=a[i-1]-i; if(a[i]<=0 || rec[a[i]]==true) a[i]=a[i-1]+i; rec[a[i]]=true; } long n; while(cin>>n) { if(n==-1)return 0; cout<<a[n]<<endl; } return 0; } Followed by:
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