Compilare: user.cpp: In function ‘int solve(int*, int, std::tr1::unordered_map<int, three_sum>, int, int*)’: user.cpp:30:18: warning: unused variable ‘m’ [-Wunused-variable] int i, j, k, m = 0; ^ user.cpp: In function ‘int printResult(int*, int, FILE*)’: user.cpp:69:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘header_data readHeader(FILE*)’: user.cpp:18:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &(h.n), &(h.s)); ^ user.cpp: In function ‘void readNumbers(int*, int, FILE*)’: user.cpp:25:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &v[i]); ^