C++ "Untitled tsp_bbcpp"

#include <iostream>
#include <stdio.h>
#include <limits.h>
using namespace std;
#define MAXN 20
int n, c[MAXN][MAXN] = {}, x[MAXN], xopt[MAXN];
int fk, fopt = INT_MAX , cmin = INT_MAX;

void input(){
    cin >> n;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++){
            cin >> c[i][j];
            if (i != j)
                cmin = cmin > c[i][j] ? c[i][j]:cmin;
        }
}

int UCV(int y, int k){
    for(int i = 2; i < k; i++)
        if (y == x[i]) return 0;
    return 1;
}

void TRY(int k){
    for(int y = 2; y <= n; y++){
        if (UCV(y, k)){
            x[k] = y;
            fk += c[x[k-1]][y];
            if (k == n){
                if (fk + c[x[k]][1] < fopt){
                    fopt = fk + c[x[k]][1];
                    for(int i = 1; i <= n; i++)
                        xopt[i] = x[i];
                }
            } else
            if (fk + cmin * (n - k + 1) < fopt) TRY(k + 1);
            fk -= c[x[k-1]][y];
        }
    }
}

int main(){
    freopen("input.txt", "r", stdin);
    input();
    x[1] = 1; fk = 0;
    TRY(2);
    for (int i = 1; i <= n; i++)
        cout << xopt[i] << " -> ";
    cout << " 1 " << endl;
    cout << "min cost = " << fopt << endl;
    return 0;
}


INPUT e.g:
5
0 3 14 18 15
3 0 4 22 20
17 9 0 16 4
9 20 7 0 18
9 15 11 5 0