Compilare: main.cpp: In function 'void mrk(int)': main.cpp:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < g[nd].size(); i++ ) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:19:34: 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:21:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &x, &y ); ^