Compilare: main.cpp: In function 'int main()': main.cpp:27:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ main.cpp:67:65: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf( fout, "%d: pop(1) write(%d)\n", k, st[1][len[i] - 1] ); ~~~~~^