Compilare: user.cpp: In function ‘void solve2()’: user.cpp:72:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1;a[i - 1][j] != -1;j++); ^ user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1;a[i][j] != -1;j++) ^ user.cpp: In function ‘int seg(int)’: user.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] } ^