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各路神仙,看看我的哪里有错,是runtime error,谢谢你们了

Posted by 121211 at 2005-01-10 15:16:16 on Problem 1663
#include<stdio.h>
#include<math.h>
void main(){
	int n,i,j,s;
	int a[5000][2];
	scanf("%d",&n);
	for(i=0;i<n;i++){
		for(j=0;j<2;j++){
			scanf("%d %d",&a[i][j]);
		}
	}
	for(i=0;i<n;i++){
		if(a[i][0]!=a[i][1]||a[i][0]!=a[i][1]+2) 
			printf("No Number\n");
		else{
		   if(a[i][0]==a[i][1]){
			  if(a[i][0]%2)  
				  s=2*a[i][0]-1;
		  	  else s=2*a[i][0];
		   }
			  else s=a[i][0]+a[i][1];
		     printf("%d",s);
		}
	}
}

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