Submission #936542

#	Time	Username	Problem	Language	Result	Execution time	Memory
936542		TAhmed33	Misspelling (JOI22_misspelling)	C++98	28 / 100	46 ms	39004 KiB

misspelling

#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
int add (int a, int b) {
	a += b; if (a >= MOD) a -= MOD;
	return a;
}
int sub (int a, int b) {
	a -= b; if (a < 0) a += MOD;
	return a;
}
int mul (int a, int b) {
	return (a * 1ll * b) % MOD;
}
int dp[300][300][27][2];
int n, m;
vector <pair <int, int>> dd[300];
int ans (int pos, int prev, int c, int x) {
	int &ret = dp[pos][prev][c][x];
	if (ret != -1) return ret;
	bool flag = 1;
	for (auto j : dd[pos]) {
		if (j.second == 0) {
			flag &= (prev >= j.first || x == 0);
		} else {
			flag &= (prev >= j.first || x == 1);
		}
	}
	if (!flag) return ret = 0;
	if (pos == 0) return ret = 1;
	ret = ans(pos - 1, prev, c, x);
	for (int i = 0; i < c; i++) {
		ret = add(ret, ans(pos - 1, pos, i, 0));
	}
	for (int i = c + 1; i < 26; i++) {
		ret = add(ret, ans(pos - 1, pos, i, 1));
	}
	return ret;
}
int main () {
	memset(dp, -1, sizeof(dp));
	cin >> n >> m;
	for (int i = 1; i <= m; i++) {
		int a, b;
		cin >> a >> b;
		int l = min(a, b), r = max(a, b);
		if (a > b) {
			dd[l - 1].push_back({r, 0});
		} else {
			dd[l - 1].push_back({r, 1});
		}
	}
	int sum = 0;
	for (int i = 0; i < 26; i++) {
		sum = add(sum, ans(n - 1, n + 1, i, 0));
	}
	cout << sum << '\n';
}

• Subtask 1: 8 / 8
• Subtask 2: 20 / 20
• Subtask 3: 0 / 29
• Subtask 4: 0 / 32
• Subtask 5: 0 / 11