Compilare: main.cpp: In function 'int main()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < E.size(); i++ ){ ~~^~~~~~~~~~ main.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = i + 1; j < E.size(); j++ ){ ~~^~~~~~~~~~ main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < E.size(); i++ ){ ~~^~~~~~~~~~ main.cpp:84:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i != Order.size() - 1 ) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:17:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &N, &M ); ^ main.cpp:19:48: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int x, y; fscanf( fin, "%d%d", &x, &y ); ^