Compilare: main.cpp: In function 'int main()': main.cpp:109:11: warning: unused variable 'i' [-Wunused-variable] int i = id[it], l = 1, r = id[it], ans = id[it]; ^ main.cpp: In function 'char nxt()': main.cpp:13:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, SZ, stdin); ^ main.cpp: In function 'int main()': main.cpp:85:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("subsiruri3.in", "r", stdin); ^ main.cpp:86:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("subsiruri3.out", "w", stdout); ^