Submission #63540

#	Time	Username	Problem	Language	Result	Execution time	Memory
63540		antimirage	Election (BOI18_election)	C++17	28 / 100	20 ms	1100 KiB

election

#include <iostream>
#include <assert.h>
#include <stdio.h>
#include <iomanip>
#include <utility>
#include <math.h>
#include <time.h>
#include <vector>
#include <set>
#include <map>

#define fr first
#define sc second
#define mk make_pair
#define pb push_back
#define sz(s) (int)s.size()
#define all(s) s.begin(), s.end()

using namespace std;

const int N = 2005;

int n, q, pref[N], suf[N], l, r, sum[N], ans, cn;

string s;

main()
{
    cin >> n >> s;

    s = ' ' + s;

    for (int i = 1; i <= n; i++)
        pref[i] = (s[i] == 'C' ? 1 : -1) + pref[i - 1];

    for (int i = n; i >= 1; i--)
        suf[i] = (s[i] == 'C' ? 1 : -1) + suf[i + 1];

    cin >> q;

    while (q--)
    {
        cn = 0;
        ans = 0;
        for (int i = 1; i<= n; i++)
            sum[i] = 0;

        scanf("%d%d", &l, &r);

        for (int i = l; i <= r; i++)
        {
            if ( pref[i] + cn < pref[l - 1] )
            {
                cn++;
                sum[l] += 1;
                sum[i + 1] -= 1;
                ans++;
            }
        }
        for (int i = 1; i<= n; i++)
            sum[i] += sum[i - 1];

        cn = 0;

        for (int i = r; i >= l; i--)
        {
            if ( sum[i] + suf[i] < suf[r + 1] - cn)
                ans++, cn++;
        }
        printf("%d\n", ans);

//        system("pause");
    }
}

Compilation message (stderr)

election.cpp:27:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
election.cpp: In function 'int main()':
election.cpp:48:14: 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 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18