func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int lace[110][110];   int main() {     int x, y, i, j;     while (cin >> n >> m) {       memset(lace, 0, sizeof(lace));       for (i = 1; i <= m; i++) {         cin >> x >> y;         lace[x][y] = lace[y][x] = 1;       }       int xx, ans = 0;       while (1) {         int g[110], num = 0;         for (i = 1; i <= n; i++) {           xx = 0;           for (j = 1; j <= n; j++)             if (lace[i][j]) xx++;           if (xx == 1) g[++num] = i;         }         for (j = 1; j <= num; j++) {           for (i = 1; i <= n; i++) lace[g[j]][i] = lace[i][g[j]] = 0;         }         if (!num) break;         ans++;       }       cout << ans << endl;     }   }   