1843794_ac_0ms_24k.cpp

北大大牛代码 1240道题的原代码 超级权威

# include <stdio.h>

void main()
{
 long N, M, P, C;
 while(scanf("%ld%ld%ld%ld",&N,&M,&P,&C)==4&&(N||M||P||C))
  printf("%ld\n",N-M+P);
}