Submission #93859

#	Time	Username	Problem	Language	Result	Execution time	Memory
93859		alexpetrescu	Game (IOI13_game)	C++14	10 / 100	13086 ms	116312 KiB

game

#include "game.h"
#include <cstring>
#include <vector>
#include <algorithm>

#define W 4

long long **mat;
long long ****rmq;
long long **aintX, **aintY, val, ans;
int nrlin, nrcol, r, c, lg2[100001], left, right, poz;

long long gcd2(long long X, long long Y) {
    long long tmp;
    while (X != Y && Y != 0) {
        tmp = X;
        X = Y;
        Y = tmp % Y;
    }
    return X;
}

void query(long long aint[], int p, int st, int dr) {
    if (left <= st && dr <= right)
        ans = gcd2(aint[p], ans);
    else {
        int m = (st + dr) / 2;
        if (left <= m) query(aint, 2 * p, st, m);
        if (m < right) query(aint, 2 * p + 1, m + 1, dr);
    }
}

void update(long long aint[], int p, int st, int dr) {
    if (st == dr)
        aint[p] = val;
    else {
        int m = (st + dr) / 2;
        if (poz <= m) update(aint, 2 * p, st, m);
        else update(aint, 2 * p + 1, m + 1, dr);
        aint[p] = gcd2(aint[2 * p], aint[2 * p + 1]);
    }
}

void init(int R, int C) {
    r = R;
    c = C;
    mat = new long long*[R];
    for (int i = 0; i < R; i++) {
        mat[i] = new long long[C];
        for (int j = 0; j < C; j++)
            mat[i][j] = 0;
    }
    nrlin = R / W;
    nrcol = C / W;
    int n = std::max(nrlin, nrcol);
    for (int i = 2; i <= n; i++)
        if ((1 << (lg2[i - 1] + 1)) == i)
            lg2[i] = lg2[i - 1] + 1;
        else
            lg2[i] = lg2[i - 1];
    aintX = new long long*[R];
    for (int i = 0; i < R; i++) {
        aintX[i] = new long long[4 * C];
        for (int j = 0; j < 4 * C; j++)
            aintX[i][j] = 0;
    }
    aintY = new long long*[C];
    for (int i = 0; i < C; i++) {
        aintY[i] = new long long[4 * R];
        for (int j = 0; j < 4 * R; j++)
            aintY[i][j] = 0;
    }
    rmq = new long long***[nrlin];
    for (int i = 0; i < nrlin; i++) {
        rmq[i] = new long long**[nrcol];
        for (int j = 0; j < nrcol; j++) {
            rmq[i][j] = new long long*[lg2[nrlin] + 1];
            for (int a = 0; a <= lg2[nrlin]; a++) {
                rmq[i][j][a] = new long long[lg2[nrcol] + 1];
                for (int b = 0; b <= lg2[nrcol]; b++)
                    rmq[i][j][a][b] = 0;
            }
        }
    }
}

void update(int P, int Q, long long K) {
    poz = Q;
    val = K;
    update(aintX[P], 1, 0, c - 1);
    poz = P;
    update(aintY[Q], 1, 0, r - 1);
    mat[P][Q] = K;
    P /= W;
    Q /= W;
    if (P < nrlin && Q < nrcol) {
        rmq[P][Q][0][0] = 0;
        for (int i = W * P; i < W * P + W; i++)
            for (int j = W * Q; j < W * Q + W; j++)
                rmq[P][Q][0][0] = gcd2(rmq[P][Q][0][0], mat[i][j]);
        for (int i = P; i < nrlin; i++) {
            for (int j = Q; j < nrcol; j++) {
                for (int b = 1; (1 << b) <= j + 1; b++)
                    rmq[i][j][0][b] = gcd2(rmq[i][j][0][b - 1], rmq[i][j - (1 << (b - 1))][0][b - 1]);
                for (int a = 1; (1 << a) <= i + 1; a++)
                    for (int b = 0; (1 << b) <= j + 1; b++)
                        rmq[i][j][a][b] = gcd2(rmq[i][j][a - 1][b], rmq[i - (1 << (a - 1))][j][a - 1][b]);
            }
        }
    }
}

long long calculate(int p, int q, int u, int v) {
    ans = 0;
    int P = p / W + bool(p % W), Q = q / W + bool(q % W), U = u / W - 1 + bool(u % W == W - 1), V = v / W - 1 + bool(v % W == W - 1);
    left = q;
    right = v;
    if (P > U) {
        for (int i = p; i <= u; i++)
            query(aintX[i], 1, 0, c - 1);
    } else {
        if (p % W)
            for (int i = p; i % W; i++)
                query(aintX[i], 1, 0, c - 1);
        if (u % W != W - 1)
            for (int i = u - u % W; i <= u; i++)
                query(aintX[i], 1, 0, c - 1);
    }
    left = p;
    right = u;
    if (Q > V) {
        for (int i = q; i <= v; i++)
            query(aintY[i], 1, 0, r - 1);
    } else {
        if (q % W)
            for (int i = q; i % W; i++)
                query(aintY[i], 1, 0, r - 1);
        if (v % W != W - 1)
            for (int i = v - v % W; i <= v; i++)
                query(aintY[i], 1, 0, r - 1);
    }

    if (P <= U && Q <= V) {
        int a = lg2[U - P + 1], b = lg2[V - Q + 1];
        ans = gcd2(ans, gcd2(gcd2(gcd2(rmq[U][V][a][b], rmq[P + (1 << a) - 1][V][a][b]), rmq[U][Q + (1 << b) - 1][a][b]), rmq[P + (1 << a) - 1][Q + (1 << b) - 1][a][b]));
    }
    return ans;
}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:18:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
  int res;
      ^~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 27
• Subtask 3: 0 / 26
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20