2.2大括号

#include <stdio.h> #include <stdlib.h> void main() { char c; int left=0,right=0; while ( (c=getchar()) != EOF ) { if ( c == '{') left++; else if ( c == '}') { if ( left <= right) printf("extor/n"); else right++; } } if ( left == right ) printf("OK/n"); else printf("NO/n"); return EXIT_SUCCESS; }