#include<stdio.h>

int s[26][26];
int m, n;
char ch[26];

int top_sort(){
	int i,j,k,c,g=0,t[26];
	char o;
	for(i=0;i<n;i++)t[i]=0;
	for(k=0;k<n;k++){
		c=0;
		for(i=0;i<n;i++)if(t[i]==0){
			for(j=0;j<n;j++)if(t[j]==0&&s[j][i]==1)break;
			if(j==n){o=char('A'+i);c++;}
		}
		t[o-'A']=1;
		if(c==0)return 1;
		if(c==1){ch[g++]=o;if(g==n)return 2;}
		if(c>1)break;
	}
	for(i=0;i<n;i++)t[i]=0;
	for(k=0;k<n;k++){
		c=0;
		for(i=0;i<n;i++)if(t[i]==0){
			for(j=0;j<n;j++)if(t[j]==0&&s[j][i]==1)break;
			if(j==n){o=char('A'+i);c++;}
		}
		t[o-'A']=1;
		if(c==0)return 1;
	}
	return 0;
}


void Sort(){
	int i,j,k;
	char str[1000][3];
	for(i=0;i<n;i++)
		for(j=0;j<n;j++)s[i][j]=0;
	for(k=0;k<m;k++){
		scanf("%s",str[k]);
		s[str[k][0]-'A'][str[k][2]-'A']=1;	
		j=top_sort();
		if(j!=0){i=k+1;goto loop;}
	}
loop:for(k++;k<m;k++)scanf("%s");
	if(j==0)printf("Sorted sequence cannot be determined.\n");
	if(j==1)printf("Inconsistency found after %d relations.\n",i);
	if(j==2) {
		printf("Sorted sequence determined after %d relations: ",i);
		for(i=0;i<n;i++)printf("%c",ch[i]);
		printf(".\n");
	}
}

int main(){
	scanf("%d",&n);
	scanf("%d",&m);
	while(m*n!=0){
		Sort();
		scanf("%d",&n);
		scanf("%d",&m);
	}
	return 1;
}

• Re:runtime error 怎么解决 (1421) 1290577924 2011-11-23 21:30:29