제출 #808986

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
808986		jakobrs	웜뱃 (IOI13_wombats)	C++17	0 / 100	12 ms	16232 KiB

wombats

#include <algorithm>
#include <numeric>
#include <queue>
#include <vector>

#ifndef EVAL
#include <iostream>
#endif

#include "wombats.h"

#define entire(a) std::begin((a)), std::end((a))

const int64_t INF = 2'000'000'000'000;

struct Matrix {
    int64_t a1 = 0, a2 = INF, b1 = INF, b2 = 0;

    Matrix operator*(const Matrix &rhs) const {
        return {
            .a1 = std::min(a1 + rhs.a1, b1 + rhs.a2),
            .a2 = std::min(b2 + rhs.a2, a2 + rhs.a1),
            .b1 = std::min(a1 + rhs.b1, b1 + rhs.b2),
            .b2 = std::min(b2 + rhs.b2, a2 + rhs.b1),
        };
    }
};

template <typename T>
struct SegmentTree {
    std::vector<T> values;
    int offset;

    SegmentTree() : values(), offset() {}
    explicit SegmentTree(int sz) : values(2 * sz), offset(sz) {}

    void update(int i, T value) {
        i += offset;

        values[i] = value;

        propagate(i);
    }

    void propagate(int i) {
        while (i /= 2) values[i] = values[2 * i] * values[2 * i + 1];
    }

    T query(int l, int r) {
        l += offset;
        r += offset;

        T left, right;
        while (l < r) {
            if (l & 1) left = left * values[l++];
            if (r & 1) right = values[--r] * right;
        }

        return left * right;
    }
};

std::vector<std::vector<int>> h, v;
int r, c;
SegmentTree<Matrix> st;
void init(int R, int C, int H[5000][200], int V[5000][200]) {
    int o = 1;
    while (o < 2 * C) o *= 2;
    st = SegmentTree<Matrix>(o);

    for (int i = 0; i < R; i++) {
        st.update(2 * i, {
                             .a1 = 0,
                             .a2 = H[i][0],
                             .b1 = H[i][0],
                             .b2 = 0,
                         });
        if (i + 1 < R) {
            st.update(2 * i + 1, {
                                     .a1 = V[i][0],
                                     .a2 = INF,
                                     .b1 = INF,
                                     .b2 = V[i][1],
                                 });
        }
    }
}

void changeH(int P, int Q, int W) {
    h[P][Q] = W;
    st.update(2 * P, {
                         .a1 = 0,
                         .a2 = h[P][0],
                         .b1 = h[P][0],
                         .b2 = 0,
                     });
}

void changeV(int P, int Q, int W) {
    v[P][Q] = W;
    st.update(2 * P + 1, {
                             .a1 = v[P][0],
                             .a2 = INF,
                             .b1 = INF,
                             .b2 = v[P][1],
                         });
}

int escape(int V1, int V2) {
    auto res = st.query(0, 2 * r);

    if (V1 == 0 && V2 == 0)
        return res.a1;
    else if (V1 == 0 && V2 == 1)
        return res.b1;
    else if (V1 == 1 && V2 == 0)
        return res.a2;
    else if (V1 == 1 && V2 == 1)
        return res.b2;
}

컴파일 시 표준 에러 (stderr) 메시지

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~
wombats.cpp: In function 'int escape(int, int)':
wombats.cpp:120:1: warning: control reaches end of non-void function [-Wreturn-type]
  120 | }
      | ^

• Subtask 1: 0 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24