Compilare: user.cpp: In function ‘long long int mp(int)’: user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < v.size() && v[i] < val; i++) { ^ user.cpp:11:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, crt; ^ user.cpp: In function ‘int main()’: user.cpp:26:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.in", "r", stdin); ^ user.cpp:28:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.out", "w", stdout); ^ user.cpp:29:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lld", &N, &K); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘long long int mp(int)’: user.cpp:16:52: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] crt = upper_bound(v.begin(), v.end(), val - v[i]) - v.begin(); ^