Language: C++

/*
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@TT_beginner
*/
#include "bits/stdc++.h"
using namespace std;
#define ok1 cerr<<"ok1\n";
#define ok2 cerr<<"ok2\n";
#define M LLONG_MAX
#define rep(i,n) for(int i=0;i<n;++i)
#define REP(i,s,n) for(int i=(s);i<(n);++i)
#define repr(i,n) for(int i=n-1;i>=0;--i)
#define REPR(i,s,n) for(int i=(s);i>=(n);--(i))
#define all(a) (a).begin(),(a).end()
#define reall(a) (a).rbegin(),(a).rend()
#define pb emplace_back //emplace_backの方が速いが使い慣れてないため
#define DOUBLE fixed << setprecision(15)
#define fi first
#define se second
#define mp make_pair
#define mt make_tuple
const double pi = acos(-1.0L);
typedef vector<int> vi;
typedef vector<string> vs;
typedef long long ll;
typedef vector<ll> vll;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<char> vc;
typedef vector<double> vd;
typedef vector<bool> vb;
typedef deque<ll> dll;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> TLL;
typedef vector<P> vP;
typedef vector<TLL> vTLL;
const ll mod = 1e9 + 7;
//const ll mod = 998244353;
ll dy[4] = { 1,0,-1,0 };
ll dx[4] = { 0,1,0,-1 };
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class A, class B>
ostream& operator<<(ostream& ost, const pair<A, B>&p) {
	ost << "{ " << p.first << ", " << p.second << " }";
	return ost;
}
template<class T>
ostream& operator<<(ostream& ost, const vector<T>&v) {
	ost << "{ ";
	for (int i = 0; i<v.size(); i++) {
		if (i)ost << ", ";
		ost << v[i];
	}
	ost << " }";
	return ost;
}
template<class A, class B>
ostream& operator<<(ostream& ost, const map<A, B>&v) {
	ost << "{ ";
	for (auto p : v) {
		ost << "{" << p.first << ", " << p.second << " }";
	}
	ost << " }";
	return ost;
}
bool out_check(ll a, ll b) { return (0 <= a && a < b); }
double pitagoras(ll a, ll b, ll c, ll d) {
	double dx = a - b, dy = c - d;
	return pow(dx * dx + dy * dy, 0.5);
}
ll modpow(ll a, ll b) { ll c = 1; while (b > 0) { if (b & 1) { c = a * c%mod; }a = a * a%mod; b >>= 1; }return c; }
void Yes(bool x) { cout << ((x) ? "Yes\n" : "No\n"); }
void YES(bool x) { cout << ((x) ? "YES\n" : "NO\n"); }
void yes(bool x) { cout << ((x) ? "yes\n" : "no\n"); }
void Yay(bool x) { cout << ((x) ? "Yay!\n" : ":(\n"); }
//*
ll  n, m, d, e, r, l, k, h, w, Q, ans, ret = M;
bool flag = false, flag2 = false, flag3 = false;
string s, t, u;

int solve1(string a, string b, string c) {
	int ans = M;
	int cnt = a.size() + b.size();
	//cout << a << " " << b << endl;
	rep(i, min(a.size(), b.size())+1) {
		flag = true;
		int a_start = a.size() - i;
		int b_start = 0;
		//cout << "i= " << i << endl;
		rep(j, i) {
			//cout << a[a_start + j] << " " << b[b_start + j] << endl;
			if (a[a_start + j] == b[b_start + j])continue;
			else if (a[a_start + j] == '?' || b[b_start + j] == '?') continue;
			else {
				flag = false;
				break;
			}
		}
		if (flag) {
			//ok1;
			chmax(ans, i);
		}
	}
	//cout << "ans = "<<ans << endl;
	return cnt - ans + solve2(b, c);
}

int solve2(string a, string b) {
	int ans = M;
	int cnt = a.size() + b.size();
	//cout << a << " " << b << endl;
	rep(i, min(a.size(), b.size()) + 1) {
		flag = true;
		int a_start = a.size() - i;
		int b_start = 0;
		//cout << "i= " << i << endl;
		rep(j, i) {
			//cout << a[a_start + j] << " " << b[b_start + j] << endl;
			if (a[a_start + j] == b[b_start + j])continue;
			else if (a[a_start + j] == '?' || b[b_start + j] == '?') continue;
			else {
				flag = false;
				break;
			}
		}
		if (flag) {
			//ok1;
			chmax(ans, i);
		}
	}
	//cout << "ans = "<<ans << endl;
	return cnt - ans;
}


int main() {
	cin.tie(0); ios::sync_with_stdio(false);//not intractive
	cin >> s >> t >> u;
	int ab = solve1(s, t, u);
	int ac = solve1(s, u, t);
	int ba = solve1(t, s, u);
	int bc = solve1(t, u, s);
	int ca = solve1(u, s, t);
	int cb = solve1(u, t, s);
	//cout << ab << " " << ac << endl;
	//cout << ba << " " << bc << endl;
	//cout << ca << " " << cb << endl;
	int a = s.size(), b = t.size(), c = u.size();
	cout << min({ ab-b,ac-c,ba-a,bc-c,ca-a,cb-b }) << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int solve1(std::string, std::string, std::string)':
a.cc:115:19: warning: overflow in conversion from 'long long int' to 'int' changes value from '9223372036854775807' to '-1' [-Woverflow]
  115 |         int ans = M;
      |                   ^
a.cc:138:28: error: 'solve2' was not declared in this scope; did you mean 'solve1'?
  138 |         return cnt - ans + solve2(b, c);
      |                            ^~~~~~
      |                            solve1
a.cc: In function 'int solve2(std::string, std::string)':
a.cc:142:19: warning: overflow in conversion from 'long long int' to 'int' changes value from '9223372036854775807' to '-1' [-Woverflow]
  142 |         int ans = M;
      |                   ^