Submission #405147

#	Time	Username	Problem	Language	Result	Execution time	Memory
405147		tsaraf	Election (BOI18_election)	C++17	0 / 100	3 ms	332 KiB

election

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

typedef long long ll;

#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()

const int N = 500 + 3;

int n, Q;
string s;

void solve(){
    
    cin >> n >> s >> Q;
    while(Q--){
        int L, R; cin >> L >> R; --L; --R;
        bool vis[n]; memset(vis, false, sizeof(vis));
        int sum = 0, ans = 0;;
        for(int i = L; i <= R; ++i){
            int vote = (s[i] == 'C' ? +1 : -1);
            if(sum + vote < 0){
                vis[i] = true;
                ++ans;
            } else {
                sum += vote;
            }
        }
        sum = 0;
        for(int i = R; i >= L; --i){
            if(!vis[i]){
                int vote = (s[i] == 'C' ? +1 : -1);
                if(sum + vote < 0){
                    vis[i] = true;
                    ++ans;
                } else {
                    sum += vote;
                }
            }
        }
        cout << ans << '\n';
    }
    
}


int main(){
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false); cin.tie(0);

    int t = 1;
    // cin >> t;


    for(int i = 1; i <= t; i++){
        // cout << "Case #" << i << ": ";

        solve();

    }
    return 0;
}

Compilation message (stderr)

election.cpp: In function 'int main()':
election.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18