func_code_string: #include <bits/stdc++.h>   using std::min;   const int MAXL = 3000000 + 9, MAXM = 5000 + 9, M = 4194304;   int tr[M + M];   int ask(int k) {     int i;     for (i = 1; i < M;)       if (k > tr[i + i]) {         k -= tr[i + i];         i += i + 1;       } else         i += i;     return i - M;   }   void change(int u, int v) {     for (u += M; u; u >>= 1) tr[u] += v;   }   int l[MAXM], r[MAXM];   int fa[MAXL];   char s[MAXL], ans[MAXL];   int main() {     int k, m, i, j, t, tot;     int ll, rr, ori;     char *p;     scanf( %s%d%d , s + 1, &k, &m);     for (i = 1; i <= m; ++i) scanf( %d%d , l + i, r + i);     for (i = 1; i <= k; ++i) change(i, 1);     tot = k;     for (i = m; i; --i) {       if (r[i] + 1 > tot) continue;       ll = r[i] - l[i] + 1;       rr = min(tot, r[i] + ll);       for (j = 1; j <= rr - r[i]; ++j) {         m = ll >> 1;         ori = j <= m ? l[i] - 1 + j + j : l[i] - 2 + 2 * (j - m);         fa[t = ask(r[i] + 1)] = ask(ori);         change(t, -1);       }       tot -= rr - r[i];     }     p = s;     for (i = 1; i <= k; ++i) ans[i] = fa[i] ? ans[fa[i]] : *++p;     puts(ans + 1);     return 0;   }   