Compilare: main.cpp: In function 'int main()': main.cpp:13:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("movedel.in", "r", stdin); ^ main.cpp:14:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("movedel.out", "w", stdout); ^ main.cpp:37:11: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] a[last] = 'a'; ~~~~~~~~^~~~~