Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[x].size(); i++) ^ user.cpp:36:19: warning: unused variable ‘i’ [-Wunused-variable] int r = v[x], i, y, t, tmax = -INF; ^ user.cpp: In function ‘int main()’: user.cpp:53:9: warning: unused variable ‘i’ [-Wunused-variable] int i, x, y, t, j, k; ^ user.cpp:53:12: warning: unused variable ‘x’ [-Wunused-variable] int i, x, y, t, j, k; ^ user.cpp:53:15: warning: unused variable ‘y’ [-Wunused-variable] int i, x, y, t, j, k; ^ user.cpp:53:21: warning: unused variable ‘j’ [-Wunused-variable] int i, x, y, t, j, k; ^ user.cpp:53:24: warning: unused variable ‘k’ [-Wunused-variable] int i, x, y, t, j, k; ^