Compilare: user.cpp: In function ‘int main()’: user.cpp:67:22: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin >> mat[i]+1; ^ user.cpp:87:47: warning: variable ‘y1’ set but not used [-Wunused-but-set-variable] int min1 = (1 << 30), x1 = 0, y1, min0 = (1 << 30), x0 = 0, y0; ^ user.cpp:87:77: warning: variable ‘y0’ set but not used [-Wunused-but-set-variable] int min1 = (1 << 30), x1 = 0, y1, min0 = (1 << 30), x0 = 0, y0; ^