Submission #1102507

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102507		LTTrungCHL	Election (BOI18_election)	C++17	28 / 100	5 ms	1108 KiB

election

///***LTT***///
/// ->NHAT QUOC GIA<- ///
#include<bits/stdc++.h>
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("popcnt")
//#define int long long
#define endl "\n"
#define F first
#define S second
#define pb push_back
using namespace std;
vector <int> lg2;
//void MAKE_LOG_ARR(int n){
//    lg2.resize(n + 3);
//    for (int i = 1;i <= n;++i){
//        lg2[i] = __lg(i);
//    }
//}
const long long oo = 1e9+7;
const int N = 5 * 1e5 + 10;
int n, q, a[N];
string s;
namespace sub1{
    int pre[2002], sur[2002], b[2002];
    void solve(){
        while (q--){
            int l, r;
            cin >> l >> r;
            for (int i = l;i <= r;++i){
                b[i] = a[i];
            }
            int ans = 0;
            for (int i = l;i <= r;++i){
                pre[i] = (i == l ? 0 : pre[i - 1] ) + b[i];
                if (pre[i] < 0){
                    b[i] = 0;
                    ++ans;
                    ++pre[i];
                }
            }
            for (int i = r;i >= l;--i){
                sur[i] = (i == r ? 0 : sur[i + 1] ) + b[i];
                if (sur[i] < 0){
                    b[i] = 0;
                    ++ans;
                    ++sur[i];
                }
            }
            cout << ans <<"\n";
        }
        return;
    }
};
void solve(){
    cin >> n;
    cin >> s;
    for (int i = 0;i < s.size();++i){
        if (s[i] == 'T'){
            a[i + 1] = -1;
        } else a[i + 1] = 1;
    }
    cin >> q;
    if (n <= 2000 and q <= 2000){
        sub1::solve();
        return;
    }
    return;
}
int main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);
    if (fopen("ltt.inp", "r")){
        freopen("ltt.inp", "r", stdin);
        freopen("ltt.out", "w", stdout);
    }
//    int t;
//    cin >> t;
//    while(t--){
    solve();
//    }
    return 0;
}

Compilation message (stderr)

election.cpp: In function 'void solve()':
election.cpp:58:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |     for (int i = 0;i < s.size();++i){
      |                    ~~^~~~~~~~~~
election.cpp: In function 'int main()':
election.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen("ltt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
election.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen("ltt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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