Compilare: main.cpp: In function 'int main()': main.cpp:58:18: warning: unused variable 'el' [-Wunused-variable] unsigned el; ^~ main.cpp:51:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] ::freopen("cautbin.in", "r", stdin); ^ main.cpp:52:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] ::freopen("cautbin.out", "w", stdout); ^ main.cpp:54:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lu", &n); ^ main.cpp:59:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u", v.get() + i); ^ main.cpp:66:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lu", &m); ^ main.cpp:68:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lu %u", &query, &lookup); ^