Compilare: main.cpp: In function 'void sort_top(int, FILE*)': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < G[node].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &m ); ^ main.cpp:29:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &x, &y ); ^