View Compilation Error

0_0_38171643_6502.cpp: In function 'int main()':
0_0_38171643_6502.cpp:29:51: error: 'strcmp' was not declared in this scope
                     if(!strcmp(ballon[i],ballon[j]))//strcmp(const char *str1,const char *str2),其比较结果如果是两个字符串相等则返回0，如果str1<str2则返回负数，如果str1>str2则返回正数
                                                   ^
0_0_38171643_6502.cpp:38:13: error: 'i' was not declared in this scope
         for(i=0;i<N;i++)
             ^