PKU 1844, Sum. AC

#include <stdio.h> int i,in,sum; int main() { do { scanf("%d",&in); }while(in<=0 || in>100000); for(i=sum=0;;i++) { sum+=i; if(sum>=in && (sum-in)%2==0) { printf("%d\n",i); break; } } }

Run ID	User	Problem	Result	Memory	Time	Language	Code Length	Submit Time
4114901	jht009	1844	Accepted	204K	0MS	C	296B	2008-09-23 15:25:49

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