func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 100001;   vector<pair<int, int> > g1[1000], g2[1000];   int edge_colors[MAXN];   pair<int, int> colors1[1000][1000];   pair<int, int> colors2[1000][1000];   int ans;   bool used[MAXN];   bool dfs(int v, int c1, int c2) {     if (used[v]) return false;     used[v] = true;     int to = colors1[v][c1].first;     int num = colors1[v][c1].second;     if (colors2[to][c2].first == -1) {       colors1[v][c1].first = -1;       colors1[v][c1].second = -1;       colors2[to][c1].first = -1;       colors2[to][c1].second = -1;       edge_colors[colors1[v][c1].second] = -1;       edge_colors[colors2[to][c1].second] = -1;       colors1[v][c2].first = to;       colors1[v][c2].second = num;       colors2[to][c2].first = v;       colors2[to][c2].second = num;       edge_colors[num] = c2;       return true;     }     int mto = colors2[to][c2].first;     int mto_num = colors2[to][c2].second;     if (colors1[mto][c1].first == -1) {       colors1[mto][c2].first = -1;       colors1[mto][c2].second = -1;       edge_colors[colors1[mto][c2].second] = -1;       colors1[mto][c1].first = to;       colors1[mto][c1].second = mto_num;       colors2[to][c1].first = mto;       colors2[to][c1].second = mto_num;       edge_colors[mto_num] = c1;       colors1[v][c1].first = -1;       colors1[v][c1].second = -1;       edge_colors[colors1[v][c1].second] = -1;       colors1[v][c2].first = to;       colors1[v][c2].second = num;       colors2[to][c2].first = v;       colors2[to][c2].second = num;       edge_colors[num] = c2;       return true;     } else if (dfs(mto, c1, c2)) {       colors1[mto][c1].first = to;       colors1[mto][c1].second = mto_num;       colors2[to][c1].first = mto;       colors2[to][c1].second = mto_num;       edge_colors[mto_num] = c1;       colors1[v][c1].first = -1;       colors1[v][c1].second = -1;       edge_colors[colors1[v][c1].second] = -1;       colors1[v][c2].first = to;       colors1[v][c2].second = num;       colors2[to][c2].first = v;       colors2[to][c2].second = num;       edge_colors[num] = c2;       return true;     }     return false;   }   int main() {     ios_base::sync_with_stdio(false);     int a, b, m;     cin >> a >> b >> m;     for (int i = 0; i < m; i++) {       int x, y;       cin >> x >> y;       x--;       y--;       g1[x].emplace_back(make_pair(y, i));       g2[y].emplace_back(make_pair(x, i));     }     for (int i = 0; i < a; i++)       if (g1[i].size() > ans) ans = g1[i].size();     for (int i = 0; i < b; i++)       if (g2[i].size() > ans) ans = g2[i].size();     for (int i = 0; i < 1000; i++)       for (int j = 0; j < 1000; j++) {         colors1[i][j] = make_pair(-1, -1);         colors2[i][j] = make_pair(-1, -1);       }     fill(edge_colors, edge_colors + m, -1);     for (int i = 0; i < a; i++) {       for (int j = 0; j < g1[i].size(); j++) {         int to = g1[i][j].first;         int num = g1[i][j].second;         if (edge_colors[num] == -1) {           bool ok = false;           for (int q = 0; q < ans; q++) {             if ((colors1[i][q].first == -1) && (colors2[to][q].first == -1)) {               edge_colors[num] = q;               colors1[i][q].first = to;               colors1[i][q].second = num;               colors2[to][q].first = i;               colors2[to][q].second = num;               ok = true;               break;             }           }         }       }     }     for (int i = 0; i < a; i++) {       for (int j = 0; j < g1[i].size(); j++) {         int to = g1[i][j].first;         int num = g1[i][j].second;         if (edge_colors[num] == -1) {           bool ok = false;           for (int q = 0; q < ans; q++) {             if ((colors1[i][q].first == -1) && (colors2[to][q].first == -1)) {               edge_colors[num] = q;               colors1[i][q].first = to;               colors1[i][q].second = num;               colors2[to][q].first = i;               colors2[to][q].second = num;               ok = true;               break;             }           }           if (!ok) {             int c1 = -1, c2 = -1;             for (int q = 0; q < ans; q++) {               if ((colors1[i][q].first != -1) && (colors2[to][q].first == -1))                 c1 = q;               if ((colors1[i][q].first == -1) && (colors2[to][q].first != -1))                 c2 = q;             }             fill(used, used + a, false);             used[i] = true;             if ((c1 == -1) || (c2 == -1))               while (true)                 ;             int mto = colors2[to][c2].first;             int mto_num = colors2[to][c2].second;             if (colors1[mto][c1].first == -1) {               colors1[mto][c2].first = -1;               colors1[mto][c2].second = -1;               edge_colors[colors1[mto][c2].second] = -1;               colors1[mto][c1].first = to;               colors1[mto][c1].second = mto_num;               colors2[to][c1].first = mto;               colors2[to][c1].second = mto_num;               edge_colors[mto_num] = c1;               colors1[i][c2].first = to;               colors1[i][c2].second = num;               colors2[to][c2].first = i;               colors2[to][c2].second = num;               edge_colors[num] = c2;             } else if (dfs(mto, c1, c2)) {               colors1[mto][c1].first = to;               colors1[mto][c1].second = mto_num;               colors2[to][c1].first = mto;               colors2[to][c1].second = mto_num;               edge_colors[mto_num] = c1;               colors1[i][c2].first = to;               colors1[i][c2].second = num;               colors2[to][c2].first = i;               colors2[to][c2].second = num;               edge_colors[num] = c2;             }           }         }       }     }     for (int i = 0; i < a; i++)       for (int q = 0; q < ans; q++)         if (colors1[i][q].first != -1) edge_colors[colors1[i][q].second] = q;     cout << ans << endl;     for (int i = 0; i < m; i++) {       cout << edge_colors[i] + 1 <<    ;     }     return 0;   }   