Compilare: user.cpp: In function ‘int main()’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[1][j] < min1) ^ user.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(d[1][j] < min2) min2 = d[1][j]; ^ user.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[1][j] < min1) min1 = d[1][j]; ^