View Compilation Error

0_0_13995580_7064.cpp: In function 'void run(int)':
0_0_13995580_7064.cpp:16:54: error: 'strcmp' was not declared in this scope
         for(j=0;j<=i;j++) if(strcmp(t[i].col,t[j].col)==0) t[j].sum++;
                                                      ^
0_0_13995580_7064.cpp:24:30: error: 'strcpy' was not declared in this scope
             strcpy(s,t[i].col);
                              ^
0_0_13995580_7064.cpp:29:33: error: 'strcmp' was not declared in this scope
             if(strcmp(t[i].col,s)<0) strcpy(s,t[i].col);
                                 ^
0_0_13995580_7064.cpp:29:55: error: 'strcpy' was not declared in this scope
             if(strcmp(t[i].col,s)<0) strcpy(s,t[i].col);
                                                       ^