Compilare: user.cpp: In function ‘int main()’: user.cpp:38:17: warning: unused variable ‘temp’ [-Wunused-variable] int temp = DFS(i, 0); ^ user.cpp:42:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < a[i].size(); ++j) { ^ user.cpp:51:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < a[i].size(); ++j) { ^ user.cpp:55:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < v[x].size(); ++h) { ^