Language: C++

#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <vector>
#include <set>
#include <queue>
#include <stack>
#include <unordered_set>
#include <unordered_map>
#include <bitset>
#include <list>
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> P;
typedef pair<ll, ll> LP;
static const int INF = 1000010000;
static const int NIL = -1;
static const int MOD = 1000000007;
 
#define FOR(i, a, b) for(int i = (a); i < (b); ++i)
#define REP(i, n) for(int i = 0; i < (n); ++i)
#define SORT(v) sort(v.begin(), v.end());
#define pb push_back
#define mp make_pair
#define np next_permutation
#define pq priority_queue
 
int gcd(int a, int b) { int c; while (b != 0) { c = a%b; a = b; b = c; }return a; }
int lcm(int a, int b) { int c = gcd(a, b); a /= c; return a*b; }
int nCr(int a, int b) { int i, r = 1; for (i = 1; i <= b; i++) { r *= (a + 1 - i); r /= i; }return r; }
int pow(int a, int b) { int i, r = 1; for (i = 1; i <= b; i++) { r *= a; }return r; }
long long llpow(long long a, long long b) { long long i, r = 1; for (i = 1; i <= b; i++) { r *= a; }return r; }
long long llgcd(long long a, long long b) { long long c; while (b != 0) { c = a%b; a = b; b = c; }return a; }
long long lllcm(long long a, long long b) { long long c = llgcd(a, b); a /= c; return a*b; }
long long llnCr(long long a, long long b) { long long i, r = 1; for (i = 1; i <= b; i++) { r *= (a + 1 - i); r /= i; }return r; }
 
//int dx4[4] = {0,1,0,-1}, dy4[4] = {-1,0,1,0};
//int dx5[5] = {-1,0,0,0,1}, dy5[5] = {0,-1,0,1,0};
//int dx8[8] = {-1,0,1,1,1,0,-1,-1}, dy8[8] = {1,1,1,0,-1,-1,-1,0};
//int dx9[9] = {-1,0,1,1,1,0,-1,-1,0}, dy9[9] = {1,1,1,0,-1,-1,-1,0,0};


int main(){
    string n, m, x, y;
    cin >> n >> m >> x >> y;
    string s = n + m + x + y;
    if(hash(s) < 1e5){
        cout << "War" << endl;
    }else{
        abort();
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:50:14: error: class template argument deduction failed:
   50 |     if(hash(s) < 1e5){
      |              ^
a.cc:50:14: error: no matching function for call to 'hash(std::string&)'
In file included from /usr/include/c++/14/string_view:50,
                 from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/functional_hash.h:59:12: note: candidate: 'template<class _Tp> hash()-> std::hash<_Tp>'
   59 |     struct hash;
      |            ^~~~
/usr/include/c++/14/bits/functional_hash.h:59:12: note:   candidate expects 0 arguments, 1 provided
/usr/include/c++/14/bits/functional_hash.h:59:12: note: candidate: 'template<class _Tp> hash(std::hash<_Tp>)-> std::hash<_Tp>'
/usr/include/c++/14/bits/functional_hash.h:59:12: note:   template argument deduction/substitution failed:
a.cc:50:14: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::hash<_Tp>'
   50 |     if(hash(s) < 1e5){
      |              ^