Compilare: user.cpp: In function ‘int main()’: user.cpp:19:22: warning: unused variable ‘d’ [-Wunused-variable] int n, m, k, i, j, d = 0, r, x; ^ user.cpp:19:32: warning: unused variable ‘x’ [-Wunused-variable] int n, m, k, i, j, d = 0, r, x; ^ user.cpp:20:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &n, &m, &k); ^ user.cpp:23:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &ma[i][j]); ^