Compilare: user.cpp: In function ‘int main()’: user.cpp:31:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 1 < Nr3.size(); i += 2){ ^ user.cpp:51:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = Start; i < Nr1.size(); ++i) ^ 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("trenul.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("trenul.out", "w", stdout); ^ user.cpp:16:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^