Submission #762644

#	Time	Username	Problem	Language	Result	Execution time	Memory
762644		gun_gan	Wall (IOI14_wall)	C++17	100 / 100	640 ms	92248 KiB

wall

#include <bits/stdc++.h>
using namespace std;

const int MX = 2e6 + 5;

struct segtree {
      int lazyMin[4 * MX], lazyMax[4 * MX], res[MX];

      // each range [l, r] consider we have a bound such that elements are
      // in [lazyMax, lazyMin], treat max updates as increase in lower bound
      // treat min updates as decrease in upper bound
      // when lazyMax = lazyMin, updates becomes equivalent to range set

      void apply(int u, int v) {
            // cout << "apply " << u << ' ' << v << '\n';

            // cout << lazyMax[u] << " " << lazyMin[u] << '\n'; 
            // cout << lazyMax[v] << " " << lazyMin[v] << '\n';

            if(lazyMax[u] <= lazyMax[v] && lazyMin[v] <= lazyMin[u]) {
                  lazyMax[u] = lazyMax[v];
                  lazyMin[u] = lazyMin[v];
            } else if(lazyMin[v] <= lazyMax[u]) {
                  lazyMax[u] = lazyMin[u] = lazyMin[v];
            } else if(lazyMin[u] <= lazyMax[v]) { 
                  lazyMax[u] = lazyMin[u] = lazyMax[v];
            } else if(lazyMax[u] < lazyMax[v] && lazyMax[v] <= lazyMin[u] && lazyMin[u] <= lazyMin[v]) {
                  lazyMax[u] = lazyMax[v];
            } else if(lazyMax[v] <= lazyMax[u] && lazyMax[u] <= lazyMin[v] && lazyMin[v] < lazyMin[u]) {
                  lazyMin[u] = lazyMin[v];
            } 
      }

      void push(int v, int l, int r) {
            if(l == r) return; 
            if(lazyMax[v] == 0 && lazyMin[v] == 1e9) return;     

            apply(v * 2 + 0, v);
            apply(v * 2 + 1, v);

            assert(lazyMax[2 * v] <= lazyMin[2 * v]);
            assert(lazyMax[2 * v + 1] <= lazyMin[2 * v + 1]);

            lazyMax[v] = 0, lazyMin[v] = 1e9;
      }

      void minimize(int v, int l, int r, int ql, int qr, int x) {
            push(v, l, r);
            if(r < ql || l > qr) return;
            if(ql <= l && qr >= r) {
                  if(lazyMax[v] > x) {
                        lazyMax[v] = lazyMin[v] = x;
                  } else if(lazyMin[v] > x) {
                        lazyMin[v] = x;
                  }
                  push(v, l, r);  
                  return;
            }
            int m = (l + r) >> 1;
            minimize(v * 2 + 0, l, m + 0, ql, qr, x);
            minimize(v * 2 + 1, m + 1, r, ql, qr, x);
      }

      void maximize(int v, int l, int r, int ql, int qr, int x) {
            push(v, l, r);
            if(r < ql || l > qr) return;
            if(ql <= l && qr >= r) {
                  if(lazyMin[v] < x) {
                        lazyMax[v] = lazyMin[v] = x;
                  } else if(lazyMax[v] < x) {
                        lazyMax[v] = x;
                  }
                  push(v, l, r);
                  return;
            }

            int m = (l + r) >> 1;
            maximize(v * 2 + 0, l, m + 0, ql, qr, x);
            maximize(v * 2 + 1, m + 1, r, ql, qr, x);
      }

      void get(int v, int l, int r) {
            push(v, l, r);
            if(l == r) {
                  res[l] = min(lazyMax[v], lazyMin[v]);
                  return;
            }

            int m = (l + r) >> 1;
            get(v * 2 + 0, l, m + 0);
            get(v * 2 + 1, m + 1, r);
      }

      void init() {
            for(int i = 0; i < 4 * MX; i++) {
                  lazyMin[i] = 1e9;
            }
      }
} st;

void buildWall(int N, int K, int op[], int l[], int r[], int h[], int finalHeight[]) {
      st.init();

      for(int i = 0; i < K; i++) {
            if(op[i] == 1) st.maximize(1, 0, N - 1, l[i], r[i], h[i]);
            else st.minimize(1, 0, N - 1, l[i], r[i], h[i]);
      }

      st.get(1, 0, N - 1);
      for(int i = 0; i < N; i++) {
            finalHeight[i] = st.res[i];
      }
}

// int op[100], l[100], r[100], h[100], N, K, f[100];

// int main() {
//       cin >> N >> K;
//       for(int i = 0; i < K; i++) {
//             cin >> op[i] >> l[i] >> r[i] >> h[i];
//       }

//       buildWall(N, K, op, l, r, h, f);
// }

• Subtask 1: 8 / 8
• Subtask 2: 24 / 24
• Subtask 3: 29 / 29
• Subtask 4: 39 / 39