Submission #568150

#	Time	Username	Problem	Language	Result	Execution time	Memory
568150		hoanghq2004	Paint By Numbers (IOI16_paint)	C++14	100 / 100	305 ms	174336 KiB

paint

#include <bits/stdc++.h>
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "paint.h"

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 2e5 + 10;
const int mod = 1e9 + 7;

int n;
int f[N][110], g[N][110];

void add(int &x, int y) {
    x += y;
    if (x >= mod) x -= mod;
}

int sum[N];

string solve_puzzle(string s, vector<int> c) {
    int n = s.size();
    int m = c.size();
    for (int i = 1; i <= n; ++i) sum[i] = sum[i - 1] + (s[i - 1] == '_');
    f[0][0] = 1;
    g[n + 1][0] = 1;
    for (int i = 1; i <= n; ++i) {
        for (int j = 0; j <= m; ++j) {
            if (s[i - 1] != 'X') f[i][j] = f[i - 1][j];
            if (j > 0 && i >= c[j - 1] && sum[i] == sum[i - c[j - 1]]) {
                if (i == c[j - 1]) {
                    if (j == 1) add(f[i][j], 1);
                } else if (s[i - c[j - 1] - 1] != 'X') add(f[i][j], f[i - c[j - 1] - 1][j - 1]);
            }
        }
    }
    for (int i = n; i >= 1; --i) {
        for (int j = 0; j <= m; ++j) {
            if (s[i - 1] != 'X') g[i][j] = g[i + 1][j];
            if (j > 0 && i + c[m - j] - 1 <= n && sum[i + c[m - j] - 1] == sum[i - 1]) {
                if (i + c[m - j] == n + 1) {
                    if (j == 1) add(g[i][j], 1);
                } else if (s[i + c[m - j] - 1] != 'X') add(g[i][j], g[i + c[m - j] + 1][j - 1]);
            }
        }
    }
    int tot = f[n][m];
    for (int i = 1; i <= n; ++i) {
        if (s[i - 1] != '.') continue;
        int cur = 0;
        for (int j = 0; j <= m; ++j) {
            add(cur, 1LL * f[i - 1][j] * g[i + 1][m - j] % mod);
        }
        if (cur == 0) s[i - 1] = 'X';
        else if (cur == tot) s[i - 1] = '_';
        else s[i - 1] = '?';
    }
    return s;
}

//
//
//const int S_MAX_LEN = 200 * 1000;
//char buf[S_MAX_LEN + 1];
//
//int main() {
//    assert(1 == scanf("%s", buf));
//    std::string s = buf;
//    int c_len;
//    assert(1 == scanf("%d", &c_len));
//    std::vector<int> c(c_len);
//    for (int i = 0; i < c_len; i++) {
//        assert(1 == scanf("%d", &c[i]));
//    }
//    std::string ans = solve_puzzle(s, c);
//
//
//    printf("%s\n", ans.data());
//    return 0;
//}

Compilation message (stderr)

paint.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
paint.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      |

• 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