Submission #737100

#	Time	Username	Problem	Language	Result	Execution time	Memory
737100		myrcella	Misspelling (JOI22_misspelling)	C++17	100 / 100	421 ms	151540 KiB

misspelling

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

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 0x3f
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
void inc(int &a,int b) {a=(a+b)%mod;}
void dec(int &a,int b) {a=(a-b+mod)%mod;}
int lowbit(int x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const int maxn = 5e5+10;

int dp[maxn][26],sum[maxn][26];
pq <pii> q1,q2;
vector <int> r1[maxn],r2[maxn];

int main() {
//	freopen("input.txt","r",stdin);	
	std::ios::sync_with_stdio(false);cin.tie(0);
	int n,m;
	cin>>n>>m;
	rep(i,0,m) {
		int u,v;
		cin>>u>>v;
		if (u<v) r1[u+1].pb(v);
		else r2[v+1].pb(u);
	}
	q1.push({1,n}),q2.push({1,n});
	rep(i,0,26) dp[1][i] = sum[1][i] = 1;
	rep(i,2,n+1) {
		for (auto it:r1[i]) q1.push({i,it});
		for (auto it:r2[i]) q2.push({i,it});
		while (q1.top().se<i) q1.pop();
		while (q2.top().se<i) q2.pop();
		int cur1 = q1.top().fi, cur2 = q2.top().fi;
//		debug(cur1),debug(cur2);
		int cur = max(cur1,cur2);
		int tmp = 0;
		if(cur!=i) {
			rep(j,0,26) inc(tmp,(sum[i-1][j] - sum[cur-1][j] + mod)%mod);
			rep(j,0,26) inc(dp[i][j],tmp),inc(dp[i][j],(-sum[i-1][j] + sum[cur-1][j] + mod)%mod);
		}
		if (cur1<cur2) { //larger
			tmp = (sum[cur2-1][0] - sum[cur1-1][0] + mod)%mod;
			rep(j,1,26) {
				inc(dp[i][j],tmp);
				inc(tmp,(sum[cur2-1][j] - sum[cur1-1][j] + mod)%mod);
			}
		}
		else if (cur2<cur1){ //smaller
			tmp = (sum[cur1-1][25] - sum[cur2-1][25] + mod)%mod;
			for (int j = 24;j>=0;j--) {
				inc(dp[i][j],tmp);
				inc(tmp,(sum[cur1-1][j] - sum[cur2-1][j] + mod)%mod);
			}
		}
		rep(j,0,26) {
			sum[i][j] = (sum[i-1][j] + dp[i][j])%mod;
			//cout<<i<<" "<<j<<" "<<dp[i][j]<<endl;
		}
	}
	int ans = 0;
	rep(i,0,26) inc(ans,sum[n][i]);
	cout<<ans;
	return 0;
}

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