Compilare: user.cpp: In function ‘int main()’: user.cpp:71:46: warning: integer overflow in expression [-Woverflow] unsigned int fin_cnt = 0, ans = (1 << 31) * 2 - 1; ^ user.cpp:104:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((__bitset[node] == bitset && __dist[node] < cost) || cost >= ans) continue; ^ user.cpp:104:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((__bitset[node] == bitset && __dist[node] < cost) || cost >= ans) continue; ^ user.cpp:106:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (bitset == fin_cnt && ans > cost) ^ user.cpp:106:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (bitset == fin_cnt && ans > cost) ^ user.cpp:115:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((pos >= 0 && it->cnt < cnt) || cost + it->cost * (cnt + 1) > ans) continue; ^ user.cpp:69:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gather.out", "w", stdout); ^ user.cpp:74:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &K, &N, &M); ^ user.cpp:78:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] mode[x] = 1; ^ user.cpp:83:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &A, &B, &C, &D); ^