Submission #1219175

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219175		lizi14	Coins (IOI17_coins)	C++20	100 / 100	8 ms	736 KiB

coins

#include "coins.h"
#include <iostream>
#include <vector>
#include <string>

using namespace std;
vector<int> coin_flips(vector<int> b, int c) {
    vector<int> flips(1);
    vector<int>v;
    for(int i=0; i<=63; i++){
        if(b[i]==1){
            v.push_back(i);
        }
    }
    int ans=0;
    int k=0;
    for(auto a:v){
        k++;
        if(k==1){
            ans=a;
        }
        else{
            ans^=a;
        }
    }
    ans^=c;
    flips[0]=ans;
    b[ans]=1;
    return flips;
}

int find_coin(vector<int> b) {
    vector<int>v;
    for(int i=0; i<=63; i++){
        if(b[i]==1){
            v.push_back(i);
        }
    }
    int ans=0;
    int k=0;
    for(auto a:v){
        k++;
        if(k==1){
            ans=a;
        }
        else{
            ans^=a;
        }
    }
    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 50 / 50