View Compilation Error

0_0_15535584_9667.cpp: In function 'void preprocess()':
0_0_15535584_9667.cpp:47:44: error: 'memset' was not declared in this scope
     memset(next_rank , 0 , sizeof next_rank);
                                            ^
0_0_15535584_9667.cpp: In function 'int dp()':
0_0_15535584_9667.cpp:119:28: error: 'memset' was not declared in this scope
     memset(f , 0 , sizeof f);
                            ^
0_0_15535584_9667.cpp: In function 'void process(int)':
0_0_15535584_9667.cpp:175:41: error: 'sort' was not declared in this scope
     sort(records.begin() , records.end());
                                         ^