Compilare: main.cpp: In function 'int 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:11:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:18:34: 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:20:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &x, &y ); ^