View Compilation Error

0_0_34257066_22814.cpp: In function 'int main()':
0_0_34257066_22814.cpp:15:25: error: 'memset' was not declared in this scope
     memset(l,0,sizeof(l));
                         ^
0_0_34257066_22814.cpp:26:19: error: 'sort' was not declared in this scope
     sort(c+1,c+m+1);
                   ^
0_0_34257066_22814.cpp:29:73: error: 'upper_bound' was not declared in this scope
       if(lower_bound(c+1,c+m+1,a[i][0]) == upper_bound(c+1,c+m+1,a[i][1]))
                                                                         ^