Compilare: main.cpp: In function 'int main()': main.cpp:41:30: warning: unused variable 'INF' [-Wunused-variable] long long sz = 0, ans = 0, INF = 2e9; ^~~ main.cpp:33:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petreceri.in", "r", stdin); ^ main.cpp:34:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petreceri.out", "w", stdout); ^ main.cpp: In function 'char advance()': main.cpp:10:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, stdin); ^