Submission #959316

#	Time	Username	Problem	Language	Result	Execution time	Memory
959316		steveonalex	Paint By Numbers (IOI16_paint)	C++17	100 / 100	346 ms	11936 KiB

paint

#include "paint.h"

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()

ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}

ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return 63 - __builtin_clzll(mask);}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
// mt19937_64 rng(69);
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }

template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 2e5 + 69, K = 101;
bitset<N> dp[K], f[K];

string solve_puzzle(string s, vector<int> c){
    s = "_" + s;
    int n = s.size();
    int k = c.size();
    c.insert(c.begin(), 0);

    s = "0" + s;

    vector<int> pref(n+1);
    for(int i= 1; i<=n; ++i) pref[i] = pref[i-1] + (s[i] == '.' || s[i] == 'X');

    dp[0][0] = f[0][0] = 1;
    for(int i= 1; i<=n; ++i) if (s[i] != 'X') dp[0][i] = dp[0][i-1] || dp[0][i];

    for(int layer = 1; layer<=k; ++layer){
        for(int i = c[layer] + 1; i<=n; ++i){
            if (pref[i] - pref[i - c[layer]] == c[layer] && s[i - c[layer]] != 'X' && dp[layer - 1][i - c[layer] - 1]){
                dp[layer][i] = f[layer][i] = 1;
            }
        }
        for(int i= 1; i<=n; ++i) if (s[i] != 'X') dp[layer][i] = dp[layer][i-1] || dp[layer][i];
    }

    vector<int> sum[2];
    for(auto &i: sum) i.resize(n+2);

    vector<int> nxt(n+1);
    for(int i = 1; i<=n; ++i){
        nxt[i] = nxt[i-1];
        if (s[i] == 'X') nxt[i] = i;
    }

    vector<int> mis; mis.push_back(n);
    for(int layer = k; layer >= 1; --layer){
        vector<int> rig(n+1, n + 2);
        for(int i = n; i>=0; --i){
            if (i < n) rig[i] = rig[i+1];
            if (f[layer][i]) rig[i] = i;
        }

        vector<int> bruh(n+2);
        for(int i: mis){
            int j = nxt[i];
            int k = rig[j];
            if (k > i) continue;
            sum[0][k+1]++; sum[0][i+1]--;
            bruh[k]++; bruh[i+1]--;
        }
        for(int i= 1; i<=n+1; ++i) bruh[i] += bruh[i-1];
        mis.clear();
        for(int i= 1; i<=n; ++i) if (bruh[i] && f[layer][i]){
            mis.push_back(i - c[layer] - 1);
            sum[0][i - c[layer]]++; sum[0][i - c[layer] + 1]--;
            sum[1][i - c[layer] + 1]++;
            sum[1][i+1]--;
        }
    }
    sum[0][1]++;
    sum[0][mis.back()+1]--;

    for(int j = 0; j<=1; ++j)
    for(int i = 1; i<=n+1; ++i){
        sum[j][i] += sum[j][i-1];
    }  

    string ans = "";
    for(int i = 2; i<=n; ++i){
        if (sum[0][i] && sum[1][i]) ans.push_back('?');
        else if (sum[0][i]) ans.push_back('_');
        else ans.push_back('X');
    }
    
    return ans;
}

// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

//     string s; cin >> s;
//     int k; cin >> k;
//     vector<int> c(k);
//     for(int i = 0; i<k; ++i) cin >> c[i];

//     cout << solve_puzzle(s, c) << "\n";
 
//     return 0;
// }

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 27 / 27
• Subtask 5: 21 / 21
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10