Compilare: user.cpp: In function ‘int main()’: user.cpp:23:29: 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:26:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &ma[i][j]); ^ user.cpp:70:39: warning: ‘ry’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d %d", rx - 1, ry - 1); ^ user.cpp:70:39: warning: ‘rx’ may be used uninitialized in this function [-Wmaybe-uninitialized]