oj.uz

Submission #479068

# Submission time Handle Problem Language Result Execution time Memory
479068 2021-10-09T21:13:16 Z Green55 Round words (IZhO13_rowords) C++17
76 / 100
 177 ms 332 KB 
#include<bits/stdc++.h>
using namespace std;
#define all(v) (v).begin(), (v).end()
 
#define uint unsigned long long
#define ull unsigned __int128
 
const int LEN = 64;
const int MAX = 3010 + LEN;
 
inline bool at(uint a[], int i){
    return a[i/LEN] & ((uint)1 << (i%LEN));
}
 
inline bool tog(uint a[], int i) {
    return a[i/LEN] ^= ((uint)1 << (i%LEN));
}
 
int n;
uint a[MAX/LEN], b[MAX/LEN], cs[26][MAX/LEN];
 
void solve(uint c[]){
    //sliding b -> a
    memcpy(a, b, sizeof(b));
    memset(b, 0, sizeof(b));
    
    // b = (a << 1) | 1
    uint carry = 1;
    for(int i=0; i<n/LEN; ++i) {
        b[i] = (a[i] << 1) | carry;
        carry = bool(a[i] & ((uint)1<<(LEN-1)));
    }
 
    // b = -b = ~b + 1
    for(int i=0; i<n/LEN; ++i) b[i] = ~b[i];
    for(int i=0; i<n; ++i) if(tog(b, i)) break;
 
    // a |= c, b += a, b &= a, b ^= a
    carry = 0;
    for(int i=0; i<n/LEN; ++i) {
        a[i] |= c[i];
        ull tmp = b[i]; tmp += a[i]; tmp += carry;
        b[i] = tmp & (~(uint)0);
        carry = tmp >> LEN;
 
        b[i] &= a[i];
        b[i] ^= a[i];
    }
}
 
int solve_tc(string s, string t) {
    memset(a, 0, sizeof(a));
    memset(b, 0, sizeof(b));
    memset(cs, 0, sizeof(cs));
 
    // init c['A'] ~ c['Z']
    for(int i=0; i<t.size(); ++i) {
        tog(cs[t[i] - 'a'], i);
    }
    n = (t.size()/LEN+1)*LEN;
 
    for(int idx=0; idx<s.size(); ++idx) {
        char c = s[idx];
        solve(cs[c - 'a']);
    }
 
    int ret = 0;
    for(int i=0; i<t.size(); ++i){
        ret += at(b, i);
    }
    // cout << s << ' ' << t << " : " << ret << endl;
    return ret;
}
 
int dp[MAX][MAX];
void chk_naive(string s, string t, int ret) {
    memset(dp, 0, sizeof(dp));
    for(int i=1; i<=s.size(); ++i) {
        for(int j=1; j<=t.size(); ++j) {
            dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
            if(s[i-1] == t[j-1])
                dp[i][j] = max(dp[i][j], dp[i-1][j-1]+1);
        }
    }
    if(dp[s.size()][t.size()] != ret) {
        cout << s << endl << t;
        exit(1);
    }
}
 
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
 
    string a, b;
    cin >> a >> b;
    for(char c : a) assert(islower(c));
    for(char c : b) assert(islower(c));
    // srand(4546);
    // for(int i=0; i<2000; ++i) a.push_back('a' + (rand()%26));
    // for(int i=0; i<2000; ++i) b.push_back('a' + (rand()%26));
 
    int ans = 0;
    for(int i=0; i<b.size(); ++i){
        int ret = solve_tc(a, b);
        //chk_naive(a, b, ret);
        ans = max(ans, ret);
        b.push_back(b[0]);
        b.erase(b.begin());
    }
    cout << ans;
}

Compilation message

rowords.cpp: In function 'int solve_tc(std::string, std::string)':
rowords.cpp:57:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i=0; i<t.size(); ++i) {
      |                  ~^~~~~~~~~
rowords.cpp:62:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |     for(int idx=0; idx<s.size(); ++idx) {
      |                    ~~~^~~~~~~~~
rowords.cpp:68:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for(int i=0; i<t.size(); ++i){
      |                  ~^~~~~~~~~
rowords.cpp: In function 'void chk_naive(std::string, std::string, int)':
rowords.cpp:78:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for(int i=1; i<=s.size(); ++i) {
      |                  ~^~~~~~~~~~
rowords.cpp:79:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for(int j=1; j<=t.size(); ++j) {
      |                      ~^~~~~~~~~~
rowords.cpp: In function 'int main()':
rowords.cpp:103:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |     for(int i=0; i<b.size(); ++i){
      |                  ~^~~~~~~~~

Subtask #1
76.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 7 ms 332 KB Output is correct
7 Correct 125 ms 312 KB Output is correct
8 Incorrect 134 ms 332 KB Output isn't correct
9 Correct 125 ms 332 KB Output is correct
10 Correct 120 ms 312 KB Output is correct
11 Correct 139 ms 332 KB Output is correct
12 Correct 154 ms 204 KB Output is correct
13 Correct 153 ms 332 KB Output is correct
14 Correct 130 ms 332 KB Output is correct
15 Correct 177 ms 332 KB Output is correct
16 Correct 142 ms 332 KB Output is correct
17 Incorrect 78 ms 204 KB Output isn't correct
18 Correct 148 ms 332 KB Output is correct
19 Correct 131 ms 308 KB Output is correct
20 Incorrect 136 ms 332 KB Output isn't correct
21 Correct 18 ms 332 KB Output is correct
22 Correct 33 ms 320 KB Output is correct
23 Correct 53 ms 204 KB Output is correct
24 Incorrect 59 ms 204 KB Output isn't correct
25 Incorrect 79 ms 312 KB Output isn't correct