Compilare: user.cpp: In function ‘int main()’: user.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < v.size(); ++ i) ^ user.cpp:28:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < v.size(); ++ j) ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banuti.in", "r", stdin); ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banuti.out", "w", stdout); ^ user.cpp:18:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:21:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^