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终于AC拉。。。晕啊。。。偶终于AC拉。。。 #include "stdio.h" #include "string.h" char a[400]; int flag; int len; int i,j; int main() { while((scanf("%s",&a))!=EOF) { flag=0; //scanf("%s",&a); len=(int)strlen(a); for(i=len-1;i>=0;i--) { if(a[i]>='p'&&a[i]<='z') { flag++; } else if(a[i]=='C'||a[i]=='D'||a[i]=='E'||a[i]=='I') { if(flag>=2) { flag--; } else { flag=0; break; } } else if(a[i]=='N') { if(flag==0) { break; } } else { flag=0; break; } } if(flag==1) { printf("YES\n"); } else { printf("NO\n"); } for(j=0;j<len;j++) { a[j]='\0'; } } return 0; } Followed by:
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