Submission #1309225

#	Time	Username	Problem	Language	Result	Execution time	Memory
1309225		thuhienne	Copy and Paste 3 (JOI22_copypaste3)	C++20	57 / 100	3096 ms	49748 KiB

copypaste3

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

using ll = long long;

#define thuhien ""
#define re exit(0);
#define hash __hash__

int n;
string s;
int a,b,c;

const ll mod = 1e9 + 7,base = 31;
ll hash[2509],power[2509];

void createhash() {
	power[0] = 1;
	for (int i = 1;i <= n;i++) {
		hash[i] = (hash[i - 1] * base + s[i] - 'a' + 1) % mod;
		power[i] = power[i - 1] * base % mod;
	}
}

int gethash(int l,int r) {
	return (hash[r] - hash[l - 1] * power[r - l + 1] + mod * mod) % mod;
}


ll dp[2509][2509];

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(nullptr);
	if (fopen(thuhien".inp","r")) {
	   freopen(thuhien".inp","r",stdin);
	   freopen(thuhien".out","w",stdout);
	}
	
	cin >> n >> s >> a >> b >> c;
	s = " " + s;
	
	createhash();
	
	memset(dp,0x3f3f,sizeof(dp));
	for (int i = 1;i <= n;i++) dp[i][i] = a;
	
	for (int len = 1;len <= n;len++) {
		for (int i = 1;i + len - 1 <= n;i++) {
			int l = i,r = i + len - 1;
			
			dp[l][r] = min(dp[l][r],min(dp[l + 1][r],dp[l][r - 1]) + a);
			
		}
		for (int i = 1;i + len - 1 <= n;i++) {
			int l = i,r = i + len - 1;
			
			int cnt = 1,last = r;
			for (int j = r + 1;j + len - 1 <= n;j++) {
				
				int x = j,y = j + len - 1;
				if (gethash(l,r) != gethash(x,y)) continue;
				
				if (x > last) {
					cnt++;
					last = y;
				}
				
				dp[l][y] = min(dp[l][y],dp[l][r] + b + 1ll * c * cnt + 1ll * (y - l + 1 - cnt * len) * a);
				
//				cout << ":D " << l << " " << r << " " << dp[l][r] << '\n';
			}
			
		}
	}
	
	cout << dp[1][n];

}

Compilation message (stderr)

copypaste3.cpp: In function 'int main()':
copypaste3.cpp:36:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |            freopen(thuhien".inp","r",stdin);
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
copypaste3.cpp:37:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |            freopen(thuhien".out","w",stdout);
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 0 / 5
• Subtask 3: 14 / 14
• Subtask 4: 10 / 10
• Subtask 5: 32 / 32
• Subtask 6: 0 / 38