Compilare: user.cpp: In function ‘int main()’: user.cpp:86:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( x = 0; x < G[varf].size(); x++ ) { ~~^~~~~~~~~~~~~~~~ user.cpp:67:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &m ); ^ user.cpp:69:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &x, &y, &c ); ^