Compilare: main.cpp: In function 'int query_all(int)': main.cpp:104:7: warning: variable 'ans' set but not used [-Wunused-but-set-variable] int ans = x; ^~~ main.cpp: In function 'void inc()': main.cpp:18:42: 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, buffer_max, stdin); ^ main.cpp: In function 'void Read()': main.cpp:37:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pandemie.in", "r", stdin); ^