Compilare: main.cpp: In function 'void Fill(int, int, int)': main.cpp:50:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < 0 || i >= n || j < 0 || j >= m || a[i][j] || num >= dir.size()) return; ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:67:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dp[i][j] == dir.size()-1) ~~~~~~~~~^~~~~~~~~~~~~~~