Submission #565088

#	Time	Username	Problem	Language	Result	Execution time	Memory
565088		birthdaycake	Saveit (IOI10_saveit)	C++17	0 / 100	269 ms	12672 KiB

encoder

#include<bits/stdc++.h>
#include "grader.h"
#include "encoder.h"

using namespace std;

int dis[1001][37];
vector<int>adj[1001];




void reset(int n, int h){
    for(int i = 0; i < n; i++){
        adj[i].clear();
        for(int j = 0; j < h; j++) dis[i][j] = INT_MAX;
    }
}


void encode(int n, int h, int p, int a[], int b[]){
    
    
    reset(n,h);
    
    
    for(int i = 0; i < p; i++){
        adj[a[i]].push_back(b[i]);
        adj[b[i]].push_back(a[i]);
    }
    
    for(int i = 0; i < h; i++){
        dis[i][i] = 0;
        set<pair<int,int>>bfs;
        bfs.insert({0,i});
        while(bfs.size()){
            auto x = *bfs.begin();
            bfs.erase(x);
            if(dis[x.second][i] < x.first) continue;
            for(auto s:adj[x.second]){
                if(dis[x.second][i] + 1 < dis[s][i]){
                    dis[s][i] = dis[x.second][i]+ 1;
                    bfs.insert({dis[x.second][i] + 1, s});
                }
            }
        }
    }
    
    for(int i = 0; i < n; i++){
        for(int j = 0; j < h; j++){
            for(int k = 0; k < 10; k++){
                if(dis[i][j] & (1 << k)) encode_bit(1);
                else encode_bit(0);
            }
        }
    }
    
    
    
    
}

decoder

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

int dis[1001][37];

void reset(int n, int h){
    for(int i = 0; i < n; i++){
        for(int j = 0; j < h; j++) dis[i][j] = 1e18;
    }
}


void decode(int n, int h){
    
    reset(n,h);
    
    
    for(int i = 0; i < n; i++){
        for(int j = 0; j < h; j++){
            if(dis[j][i] != 1e18){
                dis[i][j] = dis[j][i];
                continue;
            }
            dis[i][j] = 0;
            for(int k = 0; k < 10; k++){
                if(decode_bit()){
                    dis[i][j] += (1 << k);
                }
               
            }
        }
    }
    
    for(int i = 0; i < n; i++){
        for(int j = 0; j < h; j++){
            hops(j,i,dis[i][j]);
        }
    }
}

Compilation message (stderr)

decoder.cpp: In function 'void reset(int, int)':
decoder.cpp:10:48: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   10 |         for(int j = 0; j < h; j++) dis[i][j] = 1e18;
      |                                                ^~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25