Compilare: user.cpp: In function ‘int main()’: user.cpp:9:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:12:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &ma[2 * i][2 * j]); ^ user.cpp:54:42: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d", ((x + 1) / 2) * ((y + 1) / 2)); ^ user.cpp:54:26: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d", ((x + 1) / 2) * ((y + 1) / 2)); ^