Compilare: user.cpp: In function ‘int main()’: user.cpp:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < G[varf].size(); j++ ) { ~~^~~~~~~~~~~~~~~~ user.cpp:23:32: 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:25:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &i, &j, &cost ); ^