oj.uz

Submission #479069

# Submission time Handle Problem Language Result Execution time Memory
479069 2021-10-09T21:16:25 Z Green55 Round words (IZhO13_rowords) C++17
76 / 100
 174 ms 452 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 1 ms 204 KB Output isn't correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 7 ms 332 KB Output is correct
7 Correct 122 ms 204 KB Output is correct
8 Incorrect 116 ms 312 KB Output isn't correct
9 Correct 125 ms 204 KB Output is correct
10 Correct 122 ms 332 KB Output is correct
11 Correct 125 ms 332 KB Output is correct
12 Correct 152 ms 204 KB Output is correct
13 Correct 156 ms 204 KB Output is correct
14 Correct 139 ms 452 KB Output is correct
15 Correct 174 ms 204 KB Output is correct
16 Correct 129 ms 332 KB Output is correct
17 Incorrect 74 ms 204 KB Output isn't correct
18 Correct 144 ms 332 KB Output is correct
19 Correct 119 ms 332 KB Output is correct
20 Incorrect 126 ms 332 KB Output isn't correct
21 Correct 18 ms 336 KB Output is correct
22 Correct 32 ms 204 KB Output is correct
23 Correct 51 ms 332 KB Output is correct
24 Incorrect 53 ms 204 KB Output isn't correct
25 Incorrect 78 ms 332 KB Output isn't correct