Compilare: main.cpp: In function 'void couple1(int, int)': main.cpp:11:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:20:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void couple2(int, int)': main.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < w[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < w[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&t); ^ main.cpp:69:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:77:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^