Compilare: main.cpp: In function 'void precalc(int, int, int)': main.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:106:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < q[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:112:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < q[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int, int)': main.cpp:124:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:151:30: 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:154:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&x , &y , &z); ^ main.cpp:160:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&x); ^