Submission #711284

#	Time	Username	Problem	Language	Result	Execution time	Memory
711284		kostia244	Copy and Paste 3 (JOI22_copypaste3)	C++17	100 / 100	503 ms	102572 KiB

copypaste3

#include<bits/stdc++.h>
#define all(x) begin(x), end(x)
using namespace std;
using ll = long long;
const int N = 2525;
int n;
ll a, b, c;
ll dp[N][N], jump[N][N], best[N];
string s;
int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> s >> a >> b >> c;

    vector<int> sa(n);
    iota(all(sa), 0);
    memset(jump, -1, sizeof jump);
    auto dfs = [&](auto self, vector<int> &p, int dep) -> void {
        if(p.size() < 2)
            return;
        vector<int> ch[26];
        int j = 0;
        for(auto i : p) {
            if(i + dep < s.size())
                ch[s[i + dep] - 'a'].push_back(i);
            if(dep) {
                while(p[j] + dep - 1 < i)
                    j++;
                jump[dep][i] = j ? p[j - 1] : -1;
            }
        }
        p.clear();
        for(int i = 0; i < 26; i++) {
            self(self, ch[i], dep + 1);
        }
    };
    dfs(dfs, sa, 0);

    for(int r = 0; r < n; r++) {
        memset(best, 0x3f, sizeof best);
        for(int l = r; l >= 0; l--) {//copy string
            best[l] = min(best[l], best[l + 1]);
            dp[r][l] = min((r > l ? dp[r - 1][l] : 0) + a, (r - l + 1) * a + best[l]);
            int lst = n + 1, len = r - l + 1, cnt = 0;
            for(int p = l; p >= 0; p = jump[len][p]) {
                // if(p + len - 1 < lst &&
                //      s.substr(p, len) == s.substr(l, len)) {
                    cnt++;
                    lst = p;
                    best[p] = min(best[p], (-len * a + c) * cnt + dp[r][l] + b);
                // }
            }
        }
    }
    cout << dp[n - 1][0] << '\n';
}

Compilation message (stderr)

copypaste3.cpp: In function 'int main()':
copypaste3.cpp:43:17: warning: variable 'lst' set but not used [-Wunused-but-set-variable]
   43 |             int lst = n + 1, len = r - l + 1, cnt = 0;
      |                 ^~~
copypaste3.cpp: In instantiation of 'main()::<lambda(auto:23, std::vector<int>&, int)> [with auto:23 = main()::<lambda(auto:23, std::vector<int>&, int)>]':
copypaste3.cpp:36:19:   required from here
copypaste3.cpp:23:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |             if(i + dep < s.size())
      |                ~~~~~~~~^~~~~~~~~~

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