Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:50:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ k ].size(); ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:63:18: warning: unused variable ‘s’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:63:21: warning: unused variable ‘t’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:63:24: warning: unused variable ‘d’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^