func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 255;   const int MAXM = 30;   const int MAX = 10000;   const int INF = -1U >> 1;   int arr[MAXN];   struct MinCostFlow {     struct edge {       int n, f, c;       edge *next, *rev;       edge(int _n, int _f, int _c, edge* _next)           : n(_n), f(_f), c(_c), next(_next) {}     };     vector<edge*> edges;     int addV() {       edges.push_back((edge*)0);       return edges.size() - 1;     }     edge* makeE(int s, int t, int f, int c) {       return edges[s] = new edge(t, f, c, edges[s]);     }     void addE(int s, int t, int f, int c) {       edge *e1 = makeE(s, t, f, c), *e2 = makeE(t, s, 0, -c);       e1->rev = e2, e2->rev = e1;     }     void mcflow(int vs, int vt, int vr, int vn, int vm) {       int n = edges.size();       int cflow = 0, ccost = 0;       vector<int> dist(n);       vector<int> flow(n);       vector<edge*> from(n);       vector<bool> in(n);       queue<int> que;       while (1) {         fill(dist.begin(), dist.end(), INF);         fill(flow.begin(), flow.end(), 0);         dist[vs] = 0;         flow[vs] = INF;         que.push(vs);         while (!que.empty()) {           int v = que.front();           que.pop();           in[v] = 0;           for (edge* e = edges[v]; e; e = e->next)             if (e->f) {               int nc = dist[v] + e->c;               if (nc < dist[e->n]) {                 dist[e->n] = nc;                 flow[e->n] = min(flow[v], e->f);                 from[e->n] = e;                 if (!in[e->n]) {                   que.push(e->n);                   in[e->n] = 1;                 }               }             }         }         if (!flow[vt]) break;         int f = flow[vt];         cflow += f;         ccost += f * dist[vt];         int cur = vt;         while (cur != vs) {           edge* e = from[cur];           e->f -= f;           e->rev->f += f;           cur = e->rev->n;         }       }       vector<int> var(vn);       vector<pair<int, int> > ans;       for (int i = 0; i < vm; i++) {         int cur = vr;         while (cur != vt) {           for (edge* e = edges[cur]; e; e = e->next) {             if (!e->f) {               e->f++;               if (e->n < vn) var[e->n] = i;               cur = e->n;               break;             }           }         }       }       vector<int> num(vn, -1);       for (int i = 0; i < vn; i++) {         if (num[var[i]] != arr[i])           ans.push_back(pair<int, int>(var[i], 0)), num[var[i]] = arr[i];         ans.push_back(pair<int, int>(var[i], 1));       }       cout << ans.size() <<     << ccost + MAX * vn <<   n ;       int cnt = 0;       for (int i = 0; i < ans.size(); i++) {         if (!ans[i].second)           cout << char(ans[i].first +  a ) <<  =  << arr[cnt] <<   n ;         else {           cout <<  print(  << char(ans[i].first +  a ) <<  ) n ;           cnt++;         }       }     }   };   int n, m;   int main() {     ios ::sync_with_stdio(0);     if (fopen( input.txt ,  r )) freopen( input.txt ,  r , stdin);     cin >> n >> m;     for (int i = 0; i < n; i++) cin >> arr[i];     MinCostFlow net;     for (int i = 0; i < n + n; i++) net.addV();     int vs = net.addV(), vt = net.addV(), vr = net.addV();     net.addE(vs, vr, m, 0);     for (int i = 0; i < n; i++)       for (int j = i + 1; j < n; j++)         if (arr[i] == arr[j])           net.addE(i + n, j, 1, 0);         else           net.addE(i + n, j, 1, __builtin_popcount(arr[j]));     for (int i = 0; i < n; i++) {       net.addE(vr, i, 1, __builtin_popcount(arr[i]));       net.addE(i, i + n, 1, -MAX);     }     for (int i = 0; i < m; i++) net.addE(vr, vt, 1, 0);     for (int i = 0; i < n; i++) net.addE(i + n, vt, 1, 0);     net.mcflow(vs, vt, vr, n, m);     return 0;   }   