Submission #824433

#	Time	Username	Problem	Language	Result	Execution time	Memory
824433		devariaota	Lightning Rod (NOI18_lightningrod)	C++17	21 / 100	1220 ms	173000 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ioss ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int long long
#define tup tuple<int, int, int>
#define pii pair<int, int>
#define fi first
#define se second
#define pub push_back
#define pob pop_back
int n;
signed main() {
    ioss;
    cin >> n;
    int x[n+2] = {}, y[n+2] = {};
    if(n == 2) {
        cin >> x[1] >> y[1] >> x[2] >> y[2];
        if(abs(x[1]-x[2]) <= y[1]-y[2] || abs(x[1]-x[2]) <= y[2]-y[1]) cout << 1 << endl;
        else cout << 2 << endl;
        return 0;
    }
    bool one = 1, diff = 0;
    for(int i = 1; i <= n; i++) {
        cin >> x[i] >> y[i];
        if(y[i] != 1) one = 0;
        if(x[i] != i) diff = 1;
    }

    if(one) {
        int ans = 1;
        for(int i = 2; i <= n; i++) {
            if(x[i] != x[i-1]) ans++;
        }
        cout << ans << endl;
        return 0;
    }
    if(!diff) {
        int ans = 0;
        for(int i = 1; i <= n; i++) {
            if(i == n) {
                if(y[i-1] <= y[i]) ans++;
            }
            else {
                if(y[i] > y[i+1]) ans++, i++;
                else if(y[i] == y[i+1]) ans++;
            }
        }
        cout << ans << endl;
    }
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 10 / 10
• Subtask 7: 0 / 20