#include <bits/stdc++.h> /* unsigned seed1 = std::chrono::system_clock::now().time_since_epoch().count(); mt19937 g1.seed(seed1); ios_base::sync_with_stdio(false); cin.tie(NULL); */ using namespace std; const double PI = 2 * acos(0); typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> pii; typedef pair<int, ll> pill; typedef pair<ll, ll> pll; typedef long double ld; typedef vector<vector<ll>> matrix; map<string, int> dp1; map<string, int> dp2; char buf[25]; void load(map<string, int>& dp, int n) { while(n--) { scanf("%s", buf); dp[string(buf)]++; } } int main() { int n; scanf("%d", &n); load(dp1, n); load(dp2, n-1); for(auto x: dp1) { if(dp2[x.first] != x.second) { cout << x.first << endl; return 0; } } }

utrka.cpp: In function 'void load(std::map<std::__cxx11::basic_string<char>, int>&, int)':
utrka.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", buf);
     ~~~~~^~~~~~~~~~~
utrka.cpp: In function 'int main()':
utrka.cpp:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~