Compilare: main.cpp: In function 'void precalc(int, int, int)': main.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void calcul(int, int)': main.cpp:57:20: 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:127:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < col[cul].size() ; i++){ ~~^~~~~~~~~~~~~~~~~ main.cpp:128:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != col[cul].size() - 1 && f[lca (col[cul][i] , col[cul][i+1])] != cul){ ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:98:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:100:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^ main.cpp:105:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&val[i]); ^