Compilare: main.cpp: In function 'int main()': main.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < edge[p].size(); j++ ) { ~~^~~~~~~~~~~~~~~~ main.cpp:16:34: 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:18:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &a, &b ); ^