#include<bits/stdc++.h> using namespace std; // define //bool M1; //#define execute cerr << " Time: " << fixed << setprecision(6) << (1.0 * clock() / CLOCKS_PER_SEC) << "s\n"; //#define memory cerr << abs(&M2 - &M1)/1024.0/1024 << " MB" << "\n" #define ll long long #define ii pair <int , int> #define iii pair <int , ii> #define se second #define fi first #define all(v) (v).begin() , (v).end() #define Unique(v) sort(all(v)) , v.resize(unique(all(v)) - v.begin()) #define bit(x,i) (((x) >> (i)) & 1LL) #define flip(x,i) ((x) ^ (1LL << (i))) #define ms(d,x) memset(d , x , sizeof(d)) #define exist __exist #define ends __ends #define visit visited #define left __left #define right __right #define prev __prev #define next __next #define sitingfake 1 #define orz 1 //constant const long long mod = 1e9 + 7; const long long linf = 4557430888798830399LL; const long long nlinf = -4485090715960753727LL; const int inf = 1061109567; const int ninf = -1044266559; const int dx[] = {0 , -1 , 0 , 1}; const int dy[] = {-1 , 0 , 1 , 0}; template<typename T> bool maximize(T &a, const T &b) { if(a < b) {a = b; return 1;} return 0; } template<typename T> bool minimize(T &a, const T &b) { if(a > b) {a = b; return 1;} return 0; } void Plus(ll & a ,ll b) { b %= mod; a += b; if(a < 0) a += mod; a %= mod; return; } void Mul(ll & a, ll b) { (a *= (b % mod)) %= mod; return; } //code const int maxn = 2600; int n; string s; ll A , B , C; ll dp[maxn][maxn]; map <int , vector <ii>> mp; int next[maxn][maxn]; ll val[maxn]; ll Pow[maxn] , H[maxn]; void init() { Pow[0] = 1; for(int i = 1; i <= n; i++) { Pow[i] = (Pow[i - 1] * 366LL) % mod; } for(int i = 1; i <= n; i++) { H[i] = (H[i - 1] * 366LL + s[i]) % mod; } } ll get(int l , int r) { return (H[r] - H[l - 1] * Pow[r - l + 1] + mod * mod) % mod; } void solve(void) { cin >> n; cin >> s; cin >> A >> B >> C; s = ' ' + s; init(); for(int len = 1; len <= n; len++) { map <int , int> last; for(int l = 1; l + len - 1 <= n; l++) { int r = l + len - 1; if(l - len >= 1) last[get(l - len , l - 1)] = l - len; int curHash = (int)get(l , r); if(last.count(curHash)) { next[l][r] = last[curHash]; } } } ms(dp , 0x3f); for(int i = 1; i <= n; i++) { dp[i][i] = A; } for(int len = 1; len < n; len++) { for(int l = 1; l + len - 1 <= n; l++) { int r = l + len - 1; minimize(dp[l][r + 1] , dp[l][r] + A); minimize(dp[l - 1][r] , dp[l][r] + A); int j = next[l][r]; int cnt = 1; while(j) { ++cnt; minimize(dp[j][r] , dp[l][r] + B + 1ll * cnt * C + 1ll * (r - j + 1 - cnt * len) * A); j = next[j][j + len - 1]; } } } cout << dp[1][n]; } /** **/ //bool M2; signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define task "" if(fopen(task".inp","r")) { freopen(task".inp","r",stdin); freopen(task".out","w",stdout); } int tc = 1; // cin >> tc; while(tc--) solve(); // execute; // memory; }

copypaste3.cpp: In function 'int main()':
copypaste3.cpp:164:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  164 |        freopen(task".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
copypaste3.cpp:165:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  165 |        freopen(task".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~