func_code_string: #include <bits/stdc++.h>   using namespace std;   struct Seg {     int sa, ea, sb, eb;   } p[200005];   int cmp(Seg &a, Seg &b) {     if (a.ea != b.ea)       return a.ea < b.ea;     else       return a.sa < b.sa;   }   int n, mx[4 * 200005], mi[4 * 200005];   void creat(int l, int r, int k) {     if (l == r) {       mx[k] = p[l].sb, mi[k] = p[l].eb;       return;     }     int mid = (l + r) / 2;     creat(l, mid, 2 * k);     creat(mid + 1, r, 2 * k + 1);     mx[k] = max(mx[2 * k], mx[2 * k + 1]);     mi[k] = min(mi[2 * k], mi[2 * k + 1]);   }   int querymin(int l, int r, int al, int ar, int k) {     if (l == al && r == ar) return mi[k];     int mid = (l + r) / 2;     if (ar <= mid)       return querymin(l, mid, al, ar, 2 * k);     else if (al > mid)       return querymin(mid + 1, r, al, ar, 2 * k + 1);     else       return min(querymin(l, mid, al, mid, 2 * k),                  querymin(mid + 1, r, mid + 1, ar, 2 * k + 1));   }   int querymax(int l, int r, int al, int ar, int k) {     if (l == al && r == ar) return mx[k];     int mid = (l + r) / 2;     if (ar <= mid)       return querymax(l, mid, al, ar, 2 * k);     else if (al > mid)       return querymax(mid + 1, r, al, ar, 2 * k + 1);     else       return max(querymax(l, mid, al, mid, 2 * k),                  querymax(mid + 1, r, mid + 1, ar, 2 * k + 1));   }   int ea[200005];   int solve() {     std::sort(p + 1, p + 1 + n, cmp);     creat(1, n, 1);     for (int i = 1; i <= n; i++) ea[i] = p[i].ea;     for (int i = 1; i <= n; i++) {       if (i == 1) continue;       int left = p[i].sa;       int ans = lower_bound(ea + 1, ea + i, left) - ea;       if (ans > i - 1) continue;       int maxL = querymax(1, n, ans, i - 1, 1);       int minR = querymin(1, n, ans, i - 1, 1);       if (minR < p[i].sb || maxL > p[i].eb) return 0;     }     return 1;   }   int main() {     int i, j, k, sig = 1;     scanf( %d , &n);     for (i = 1; i <= n; i++)       scanf( %d %d %d %d , &p[i].sa, &p[i].ea, &p[i].sb, &p[i].eb);     sig &= solve();     for (i = 1; i <= n; i++) swap(p[i].sa, p[i].sb), swap(p[i].ea, p[i].eb);     sig &= solve();     if (sig)       printf( YES n );     else       printf( NO n );   }   