Compilare: main.cpp: In function 'void add(int, int, int)': main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = x; i <= a[no].size()-1; i += zeros(i)) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int caut(int, int, int, int)': main.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'void solve(int)': main.cpp:93:39: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] else if(biff[x]==1) ga << last << "\n"; ^~~~