Compilare: user.cpp: In function ‘int main()’: user.cpp:19:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (stiva.size()+(n-i+1)>=m) { ^ user.cpp:21:69: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (stiva[x]<c-'0' &&x>=0 &&stiva.size()+(n-i+1)>m) {stiva.pop_back();--x;} ^ user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (stiva.size()<m) stiva.push_back(c-'0'); ^