Compilare: user.cpp: In function ‘bool ok(int)’: user.cpp:92:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (curr_ans.size() <= K); ^ user.cpp: In function ‘int main()’: user.cpp:125:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ans.size(); i++) ^ user.cpp:97:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("salvare.in", "r", stdin); ^ user.cpp:98:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("salvare.out", "w", stdout); ^ user.cpp:100:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &arb.N, &K); ^ user.cpp:104:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &x, &y); ^ user.cpp:36:9: warning: ‘ras’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (dp[ordine[i].second] > K) ^ user.cpp:109:16: note: ‘ras’ was declared here int p, u, mij, ras; ^