Compilare: main.cpp: In function 'int main()': main.cpp:30:8: warning: operation on 'i' may be undefined [-Wsequence-point] arr[--i] = arr[i + 1]; --n; } } ^~~ main.cpp:24:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("climbers.in", "r", stdin); ^ main.cpp:25:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("climbers.out", "w", stdout); ^