Compilare: user.cpp: In function ‘void quick(long int, long int, int)’: user.cpp:36:96: warning: operation on ‘dif[j][index]’ may be undefined [-Wsequence-point] dif[i][index] = dif[i][index] + dif[j][index] - (dif[j][index] = dif[i][index]); ^ user.cpp:37:116: warning: operation on ‘dif[j][(1 - index)]’ may be undefined [-Wsequence-point] dif[i][1 - index] = dif[i][1 - index] + dif[j][1 - index] - (dif[j][1 - index] = dif[i][1 - index]); ^ user.cpp:15:13: warning: unused variable ‘ok’ [-Wunused-variable] int ok; ^