Compilare: main.cpp: In function 'int main()': main.cpp:23:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutari3.in", "r", stdin); ^ main.cpp:24:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutari3.out", "w", stdout); ^ main.cpp:27:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:29:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ main.cpp:41:44: warning: 'dr' may be used uninitialized in this function [-Wmaybe-uninitialized] if (st == 1 || (st != 1 && a[st] > a[dr])) { ~~~~^ main.cpp:41:36: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized] if (st == 1 || (st != 1 && a[st] > a[dr])) { ~~~~^