#include<bits/stdc++.h> using namespace std; #define foru(i,a,b) for(int i=(a); i<=(b); ++i) #define ford(i,a,b) for(int i=(a); i>=(b); --i) #define rep(i,a) for(int i=0; i<(a); ++i) #define sz(a) (int)(a).size() #define all(a) (a).begin(),(a).end() #define bit(s,i) (((s)>>(i))&1) #define ii pair<int,int> #define vi vector<int> #define vii vector<ii> #define fi first #define se second #define ll long long #define eb emplace_back #define pb push_back #define __builtin_popcount __builtin_popcountll #define _ << " " << template <class X, class Y> bool maxi(X &x, Y y){return x<y?x=y,true:false;} template <class X, class Y> bool mini(X &x, Y y){return x>y?x=y,true:false;} const int N=2525; int n,a,b,c,lcs[N][N],maxB[N][N]; ll dp[N][N]; string s; void solve(){ cin>>n>>s; s=" "+s; cin>>a>>b>>c; foru(i,1,n) foru(j,1,n) if(s[i]==s[j]) lcs[i][j]=lcs[i-1][j-1]+1; foru(i,1,n){ foru(j,i,n){ int tmp=max(i+1, j-lcs[i][j]+1); maxi(maxB[tmp][j],i); } } foru(i,1,n) foru(j,1,n) maxi(maxB[i][j],maxB[i-1][j]); memset(dp,0x3f,sizeof(dp)); foru(r,1,n){ dp[r][r]=a; ford(l,r,1){ mini(dp[l-1][r], dp[l][r]+a); mini(dp[l][r+1], dp[l][r]+a); int len=r-l+1, lst=r, cnt=1; while(true){ lst=maxB[lst-len+1][lst]; if(lst==0) break; ++cnt; mini(dp[lst-len+1][r], dp[l][r] + b + 1LL*c*cnt + 1LL*a*(r-(lst-len+1)+1 - cnt*len)); } } } cout<<dp[1][n]<<'\n'; } int32_t main(){ #define task "test" if(fopen(task".inp", "r")){ freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } cin.tie(0)->sync_with_stdio(0); int tc=1; //cin>>tc; foru(i,1,tc){ solve(); } }

copypaste3.cpp: In function 'int32_t main()':
copypaste3.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
copypaste3.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~