Submission #759750

#	Time	Username	Problem	Language	Result	Execution time	Memory
759750		vjudge1	Election (BOI18_election)	C++17	28 / 100	8 ms	976 KiB

election

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define onbit __builtin_popcount
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e18
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
using namespace __gnu_pbds;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const ll MOD = 1e9+9;
const int nax = 2e3+5;
const int MAX_VAL = 1e6;
double PI=3.14159265359;
int arx[8]={1,1,0,-1,-1,-1, 0, 1};
int ary[8]={0,1,1, 1, 0,-1,-1,-1};
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
int vis[nax];
int main(){
    optimise;
    /*#ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif*/
    //setIO("redistricting");
    int n;
    string t;
    cin>>n;
    cin>>t;
    int q;cin>>q;
    while(q--)
    {
        for (int i = 0; i < n; ++i)
        {
            vis[i]=false;
        }
        int l,r;
        cin>>l>>r;
        l--;r--;
        int cur=0;
        for (int i = l; i <= r; ++i)
        {
            if (t[i]=='C') cur++;
            else cur--;
            if (cur<0){
                vis[i]=true;
                cur++;
            }
        }cur=0;
        for(int i=r;i>=l;i--)
        {
            if (t[i]=='C') cur++;
            else if (t[i]=='T'&&vis[i]==0) cur--;
            if (cur<0){
                vis[i]=true;
                cur++;
            }
        }
        int res=0;
        for (int i = l; i <= r; ++i)
        {
            //cout << vis[i]<<" ";
            if (vis[i]&&t[i]=='T')res++;
        }//cout << endl;
        cout << res<<endl;
    }
}

Compilation message (stderr)

election.cpp: In function 'void setIO(std::string)':
election.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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