oj.uz

Submission #63825

# Submission time Handle Problem Language Result Execution time Memory
63825 2018-08-03T04:03:07 Z Just_Solve_The_Problem Election (BOI18_election) C++11
100 / 100
 980 ms 40176 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pii pair < int, int >
#define fr first
#define sc second
#define mk make_pair
#define pb push_back

const int N = (int)5e5 + 7;
const int inf = (int)1e9 + 7;

int n;
string s;
vector < pii > query[N];
vector < int > stk;
int b[N];

struct TT {
  int suf, sum;
  TT() {}
};

struct T {
  TT tree[N * 4];
  void upd(int pos, int val, int v = 1, int l = 1, int r = n) {
    if (l == r) {
      tree[v].sum = val;
      tree[v].suf = min(val, 0);
      return ;
    }
    int mid = (l + r) >> 1;
    if (pos <= mid) {
      upd(pos, val, v + v, l, mid);
    } else {
      upd(pos, val, v + v + 1, mid + 1, r);
    }
    tree[v].sum = tree[v + v].sum + tree[v + v + 1].sum;
    tree[v].suf = min(tree[v + v].suf + tree[v + v + 1].sum, tree[v + v + 1].suf);
  }
  pii get(int l, int r, int v = 1, int tl = 1, int tr = n) {
    if (tl > r || tr < l) return mk(0, 0);
    if (l <= tl && tr <= r) {
      return mk(tree[v].sum, tree[v].suf);
    }
    int mid = (tl + tr) >> 1;
    pii res1, res2;
    res1 = get(l, r, v + v, tl, mid);
    res2 = get(l, r, v + v + 1, mid + 1, tr);
    return mk(res1.fr + res2.fr, min(res1.sc + res2.fr, res2.sc));
  }
};
T tr;

void precalc() {
  for (int i = 1; i <= n; i++) {
    b[i] = ((s[i] == 'C') ? 1 : -1);
    tr.upd(i, 1);
  }
}

int ans[N];

main() {
  scanf("%d", &n);
  cin >> s;
  s = " " + s;
  precalc();
  int q;
  scanf("%d", &q);
  for (int i = 1; i <= q; i++) {
    int l, r;
    scanf("%d %d", &l, &r);
    query[l].pb(mk(r, i));
  }
  for (int i = n; i >= 1; i--) {
    if (b[i] == -1) {
      stk.pb(i);
      tr.upd(i, 0);
      b[i] = 0;
    } else if (b[i] == 1) {
      if (!stk.empty()) {
        tr.upd(stk.back(), -1);
        b[stk.back()] = -1;
        stk.pop_back();
      }
    }
    for (pii to : query[i]) {
//      cout << upper_bound(stk.rbegin(), stk.rend(), to.fr) - stk.rbegin() << ' ' << tr.get(1, to.fr).sc << endl;
      ans[to.sc] = upper_bound(stk.rbegin(), stk.rend(), to.fr) - stk.rbegin() - tr.get(1, to.fr).sc;
    }
  }
  for (int i = 1; i <= q; i++) {
    printf("%d\n", ans[i]);
  }
}

Compilation message

election.cpp:66:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
election.cpp: In function 'int main()':
election.cpp:67:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
election.cpp:72:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &q);
   ~~~~~^~~~~~~~~~
election.cpp:75:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &l, &r);
     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 12152 KB Output is correct
2 Correct 17 ms 12388 KB Output is correct
3 Correct 18 ms 12388 KB Output is correct
4 Correct 17 ms 12420 KB Output is correct
5 Correct 17 ms 12420 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 12152 KB Output is correct
2 Correct 17 ms 12388 KB Output is correct
3 Correct 18 ms 12388 KB Output is correct
4 Correct 17 ms 12420 KB Output is correct
5 Correct 17 ms 12420 KB Output is correct
6 Correct 100 ms 16784 KB Output is correct
7 Correct 89 ms 16784 KB Output is correct
8 Correct 128 ms 16784 KB Output is correct
9 Correct 110 ms 16784 KB Output is correct
10 Correct 95 ms 16784 KB Output is correct
11 Correct 124 ms 16960 KB Output is correct
12 Correct 123 ms 16960 KB Output is correct
13 Correct 142 ms 17192 KB Output is correct
14 Correct 106 ms 17192 KB Output is correct
15 Correct 114 ms 17192 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 12152 KB Output is correct
2 Correct 17 ms 12388 KB Output is correct
3 Correct 18 ms 12388 KB Output is correct
4 Correct 17 ms 12420 KB Output is correct
5 Correct 17 ms 12420 KB Output is correct
6 Correct 100 ms 16784 KB Output is correct
7 Correct 89 ms 16784 KB Output is correct
8 Correct 128 ms 16784 KB Output is correct
9 Correct 110 ms 16784 KB Output is correct
10 Correct 95 ms 16784 KB Output is correct
11 Correct 124 ms 16960 KB Output is correct
12 Correct 123 ms 16960 KB Output is correct
13 Correct 142 ms 17192 KB Output is correct
14 Correct 106 ms 17192 KB Output is correct
15 Correct 114 ms 17192 KB Output is correct
16 Correct 926 ms 37576 KB Output is correct
17 Correct 781 ms 37576 KB Output is correct
18 Correct 826 ms 37576 KB Output is correct
19 Correct 831 ms 37576 KB Output is correct
20 Correct 898 ms 37576 KB Output is correct
21 Correct 877 ms 39216 KB Output is correct
22 Correct 980 ms 39216 KB Output is correct
23 Correct 847 ms 40176 KB Output is correct
24 Correct 913 ms 40176 KB Output is correct
25 Correct 819 ms 40176 KB Output is correct