Compilare: user.cpp: In function ‘void check()’: user.cpp:225:7: warning: unused variable ‘l’ [-Wunused-variable] int l = start[0][sMax].l; ^ user.cpp:226:7: warning: unused variable ‘c’ [-Wunused-variable] int c = start[0][sMax].c; ^ user.cpp: In function ‘int main()’: user.cpp:241:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &M); ^ user.cpp:243:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s", s[i] + 1); ^ user.cpp:275:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mz.out", "w", stdout); ^ user.cpp: In function ‘void check()’: user.cpp:228:8: warning: ‘*((void*)& result +4)’ is used uninitialized in this function [-Wuninitialized] pair result = explore(start[0][sMax]); ^