Compilare: user.cpp: In function ‘void task2()’: user.cpp:80:21: warning: unused variable ‘r1’ [-Wunused-variable] int r1 = i - max(1, i - d), r2 = max(n, i + d) - i, ^ user.cpp:80:45: warning: unused variable ‘r2’ [-Wunused-variable] int r1 = i - max(1, i - d), r2 = max(n, i + d) - i, ^ user.cpp:81:21: warning: unused variable ‘c1’ [-Wunused-variable] c1 = j - max(1, j - d), c2 = max(m, j + d) - 1; ^ user.cpp:81:45: warning: unused variable ‘c2’ [-Wunused-variable] c1 = j - max(1, j - d), c2 = max(m, j + d) - 1; ^ user.cpp: In function ‘int main()’: user.cpp:110:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &t, &n, &m, &d); ^ user.cpp:114:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^