Compilare: user.cpp: In function ‘void dfs(int, int, int, int)’: user.cpp:23:9: warning: unused variable ‘ni’ [-Wunused-variable] int ni = -1,nj = -1,nord = -1; ^ user.cpp:23:17: warning: unused variable ‘nj’ [-Wunused-variable] int ni = -1,nj = -1,nord = -1; ^ user.cpp:23:25: warning: unused variable ‘nord’ [-Wunused-variable] int ni = -1,nj = -1,nord = -1; ^ user.cpp: In function ‘int main()’: user.cpp:73:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (best < a[ni][nj]) ^ user.cpp:75:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (best == a[ni][nj]) ^ user.cpp:85:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[N][i] > Best) ^ user.cpp:87:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (a[N][i] == Best) ^ user.cpp:99:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (Best == a[N][i]) ^ user.cpp:101:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (w[N][i] + have < st) { ^ user.cpp:105:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (have >= dr) break; ^ user.cpp:107:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (have < st) j = st - have,have = st - 1; ^ user.cpp:108:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; j <= w[N][i] && have < dr; j++) ^