Compilare: main.cpp: In function 'void precalc(int)': main.cpp:32:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs_lant(int, int)': main.cpp:46:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:64:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int query(int)': main.cpp:119:15: warning: unused variable 'aux' [-Wunused-variable] int sum , aux; ^~~ main.cpp: In function 'int main()': main.cpp:142:31: warning: unused variable 'sol' [-Wunused-variable] int n , i , x , y , nod , sol , powe , q , op , aux , vecin , p; ^~~ main.cpp:142:37: warning: unused variable 'powe' [-Wunused-variable] int n , i , x , y , nod , sol , powe , q , op , aux , vecin , p; ^~~~ main.cpp:142:53: warning: unused variable 'aux' [-Wunused-variable] int n , i , x , y , nod , sol , powe , q , op , aux , vecin , p; ^~~ main.cpp:143:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff , 1 , 4000000 , fin); ^