oj.uz

Submission #571650

# Submission time Handle Problem Language Result Execution time Memory
571650 2022-06-02T13:02:28 Z nttt Election (BOI18_election) C++14
0 / 100
 2 ms 340 KB 
#include<bits/stdc++.h>
using namespace std;
#define MASK(i) (1LL << (i))
#define BIT(x, i) ((x >> (i)) & 1)
#define fi first
#define se second
#define ll long long
#define task "name" 

const int oo = 1e9 + 7;
const ll loo = (ll)1e18 + 7;
const int MOD = 1e9 + 7;
const int N = 5e5 + 3;
const int BASE = 10;

template <typename T1, typename T2> bool minimize(T1 &a, T2 b)
{
    if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b)
{
    if (a < b) {a = b; return true;} return false;
}

struct nodes
{
    int sum = 0;
    int pr = 0;
    int sf = 0;
    int ans = 0;
} node[4 * N], base;
int n;
string s;
nodes add(nodes a, nodes b) 
{
	nodes c;
	c.sum = a.sum + b.sum;
	c.pr = a.pr + b.pr;
	c.sf = a.sf + b.sf;
	c.ans = max(a.sum + b.ans, a.ans + b.sum);
	c.ans = max(c.ans, a.pr + b.sf);
    //c.ans = max(c.pr, c.sf);
	return c;
}
void build(int id, int l, int r, int pos, int x)
{
    if(l > r || pos < l || r < pos) return;
    if (l == r) 
    {
	    node[id].sum = x;
		maximize(node[id].pr, x);
		maximize(node[id].sf, x);
		maximize(node[id].ans, x);
		return;
	}
    int mid = (l + r)/2;
	build(id * 2, l, mid, pos, x);
    build(id * 2 + 1, mid + 1, r, pos, x);
	node[id] = add(node[id * 2], node[id * 2 + 1]);
}

nodes get(int id, int l, int r, int u, int v)
{
    if (r < u || v < l) return base;
	if (u <= l && r <= v) return node[id];
    int mid = (l + r)/2;
	return add(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    freopen(task".inp" , "r" , stdin);
    //freopen(task".out" , "w" , stdout);
    
    cin >> n >> s;
    for (int i = 0; i < n; i++)
    {
        if(s[i] == 'T') build(1, 1, n, i + 1, 1);
        else build(1, 1, n, i + 1, -1);
    }
    int q;
    cin >> q;
    while(q--)
    {
        int l, r;
        cin >> l >> r;
        cout << get(1, 1, n, l, r).ans << '\n';
    }
 
    return 0;
}

Compilation message

election.cpp: In function 'int main()':
election.cpp:72:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     freopen(task".inp" , "r" , stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 54.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -