Compilare: user.cpp: In function ‘int main()’: user.cpp:22:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fi>>n>>C+1; ^ user.cpp:51:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[0].size();i++) ^ user.cpp:54:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[1].size();i++) ^