Compilare: user.cpp: In function ‘int main()’: user.cpp:26:12: warning: unused variable ‘x’ [-Wunused-variable] int n, i, x, y, c, j, k; ^ user.cpp:26:15: warning: unused variable ‘y’ [-Wunused-variable] int n, i, x, y, c, j, k; ^ user.cpp:26:18: warning: unused variable ‘c’ [-Wunused-variable] int n, i, x, y, c, j, k; ^ user.cpp:29:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:33:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &v[i][j]); ^