Submission #944177

#	Time	Username	Problem	Language	Result	Execution time	Memory
944177		wii	Wombats (IOI13_wombats)	C++17	39 / 100	20088 ms	18856 KiB

wombats

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

const int MaxR = 5000 + 2;
const int MaxC = 200 + 2;
const int Inf = 0x3f3f3f3f;

template<typename T> bool maximize(T &res, const T &val) { if (res < val) { res = val; return true; } return false; }
template<typename T> bool minimize(T &res, const T &val) { if (val < res) { res = val; return true; } return false; }

void init(int R, int C, int H[5000][200], int V[5000][200]);
void changeH(int P, int Q, int W);
void changeV(int P, int Q, int W);
int escape(int V1, int V2);

int r, c;
int h[MaxR][MaxC];
int v[MaxR][MaxC];
int dp[MaxR][MaxC];

int tmp[MaxC];
struct comp {
    bool operator() (int a, int b) {
        return tmp[a] < tmp[b];
    }
};

void bfs(int u) {
    for (int i = 0; i < c; ++i)
        tmp[i] = Inf;
    tmp[u] = 0;

    for (int i = 0; i < r; ++i) {
        set<int> q;
        for (int j = 0; j < c; ++j) if (tmp[j] != Inf)
            q.emplace(j);

        while (!q.empty()) {
            auto u = *q.begin(); q.erase(q.begin());
            int w = tmp[u];

            if (u + 1 < c) {
                if (minimize(tmp[u + 1], tmp[u] + h[i][u]))
                    q.emplace(u + 1);
            }

            if (u > 0) {
                if (minimize(tmp[u - 1], tmp[u] + h[i][u - 1]))
                    q.emplace(u - 1);
            }
        }



        if (i + 1 < r)
        for (int j = 0; j < c; ++j)
            tmp[j] += v[i][j];
    }

    for (int j = 0; j < c; ++j)
        dp[u][j] = tmp[j];
}

void build() {
    for (int i = 0; i < c; ++i) {
        bfs(i);
    }
}

void changeH(int P, int Q, int W) {
    h[P][Q] = W;
    build();
}

void changeV(int P, int Q, int W) {
    v[P][Q] = W;
    build();
}

void init(int R, int C, int H[5000][200], int V[5000][200]) {
    r = R;
    c = C;

    for (int i = 0; i < r; ++i)
        for (int j = 0; j < c - 1; ++j)
            h[i][j] = H[i][j];

    for (int i = 0; i - 1 < r; ++i)
        for (int j = 0; j < c; ++j)
            v[i][j] = V[i][j];

   build();
}

int escape(int V1, int V2) {
    return dp[V1][V2];
}

Compilation message (stderr)

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 'void bfs(int)':
wombats.cpp:41:17: warning: unused variable 'w' [-Wunused-variable]
   41 |             int w = tmp[u];
      |                 ^

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