Compilare: user.cpp: In function ‘int main()’: user.cpp:76:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:77:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:80:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Q); ^ user.cpp:83:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lld%lld", &op, &x, &y); ^ user.cpp: In function ‘bool check(lld, lld)’: user.cpp:56:27: warning: ‘a2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(a1 != b1 || a2 != b2) { ^ user.cpp:56:27: warning: ‘b2’ may be used uninitialized in this function [-Wmaybe-uninitialized]