제출 #275110

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
275110		wutwere	Lasers (NOI19_lasers)	C++17	24 / 100	461 ms	25744 KiB

lasers

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

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	map<int, int> pref;
	int l, r; cin >> l >> r;
	for (int i = 0; i < r; i++) {
		int x; cin >> x;
		vector<int> vals(x);
		int sum = 0, pos = 0;
		for (int j = 0; j < x; j++) {
			cin >> vals[j];
			sum += vals[j];
		}
		for (int j = 0; j < x; j++) {
			int len = l - sum - pos + vals[j];
			if (vals[j] - (len - vals[j]) > 0) {
				pref[l - sum]++;
				pref[l - sum + vals[j] - (len - vals[j])]--;
			}
			sum -= vals[j];
			pos += vals[j];
		}
	}
	int cnt = 0, start = 0, ans = 0;
	for (auto i : pref) {
		cnt += i.second;
		if (i.second > 0) {
			if (cnt == 1) {
				start = i.first;
			}
		} else {
			if (cnt == 0) {
				ans += i.first - start;
			}
		}
	}
	cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 14 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13