Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < G[X].size(); i ++ ) { ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:91:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < E[X].size(); i ++ ) { ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:141:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < G[i].size(); j ++ ) { ^ user.cpp:161:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < E[X].size(); j ++ ) { ^ user.cpp:174:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < SCC[ Heap[1] - 1 ].size(); i ++ ) ^ user.cpp:181:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < E[ Heap[1] ].size(); i ++ ) { ^ user.cpp:198:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Sol.size(); i ++ ) ^ user.cpp: In member function ‘void inputReader::advance()’: user.cpp:26:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, inputFile ); ^ user.cpp: In constructor ‘inputReader::inputReader(const char*)’: user.cpp:38:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, inputFile ); ^