Compilare: user.cpp: In function ‘int main()’: user.cpp:54:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { ^ user.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { ^ user.cpp:76:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { ^ user.cpp:33:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.out", "w", stdout); ^ user.cpp:34:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ^ user.cpp:36:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] ^ user.cpp:43:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] a.push_back( {val, {i,j} } ); ^