Submission #1361239

#TimeUsernameProblemLanguageResultExecution timeMemory
1361239maya_sMosaic (IOI24_mosaic)C++20
0 / 100
926 ms2162688 KiB
#include "mosaic.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll f[1][200200];
ll n;

void update(ll i, ll j, ll val){
    for(i; i <= n; i += i&-i) for(ll k = j; k <= n; k += k&-k) f[i][k] += val;
}

ll query(ll i, ll j){
    ll sum = 0;
    for(i; i > 0; i -= i&-i) for(ll k = j; k > 0; k -= k&-k) sum += f[i][k];
    return sum;
}

ll sum(ll a, ll b, ll c, ll d){
    return query(c, d) - query(a-1, d) - query(c, b-1) + query(a-1, b-1);
}

vector<long long> mosaic(vector<int> x, vector<int> y, vector<int> t, vector<int> b, vector<int> l, vector<int> r) {
  n = x.size();
  vector<vector<ll>> v(n+1, vector<ll>(n+1));
  for(ll i = 0; i < n; i++) v[1][i+1] = x[i];
  // for(ll j = 0; j < n; j++) v[j+1][1] = y[j];
  // for(ll i = 2; i <= n; i++) for(ll j = 2; j <= n; j++) v[i][j] = (!v[i][j-1] && !v[i-1][j]);
  for(ll i = 1; i <= 1; i++) for(ll j = 1; j <= n; j++) update(i, j, v[i][j]);
  ll q = t.size();
  vector<ll> ans(q);
  for(ll i = 0; i < q; i++) ans[i] = sum(t[i]+1, l[i]+1, b[i]+1, r[i]+1);
  return ans;
}
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