Compilare: user.cpp: In function ‘void solve()’: user.cpp:112:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (best > cyclesComp[cycleIdx].size()) { ^ user.cpp:139:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (best > cyclesComp[cycleIdx].size()) { ^ user.cpp: In function ‘void read()’: user.cpp:18:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:22:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘int main()’: user.cpp:164:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.in", "r", stdin); ^ user.cpp:165:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out", "w", stdout); ^ user.cpp: In function ‘void solve()’: user.cpp:150:33: warning: ‘bestCycle’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(cyclesComp[bestCycle][0], spec, false); ^ user.cpp:123:43: warning: ‘bestCycle’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (auto& x: cyclesComp[bestCycle]) { ^