Compilare: main.cpp: In function 'int main()': main.cpp:55:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.in", "r", stdin); ^ main.cpp:56:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.out", "w", stdout); ^ main.cpp:59:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:66:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:81:11: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d\n", xormax , st + 1 , dr); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~