Compilare: user.cpp: In function ‘int main()’: user.cpp:24:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[d].size() && v[d][j] < i; ++j)mn = v[d][j]; ^ user.cpp:32:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[a[i]].size() && v[a[i]][j] < i; ++j)mn = v[a[i]][j]; ^