Submission #829622

#	Time	Username	Problem	Language	Result	Execution time	Memory
829622		MrDeboo	Coins (IOI17_coins)	C++17	100 / 100	8 ms	1552 KiB

coins

#include "coins.h"
#include "bits/stdc++.h"
using namespace std;
std::vector<int> coin_flips(std::vector<int> b, int c) {
    bool bl=0;
    int g=0;
    for(int i=0;i<64;i++){
        if(b[i])g^=i;
    }
    for(int i=0;i<b.size();i++){
        if((g^i)==c){
            bl=1;
            return {i};
        }
    }
    assert(bl);
    return {};
}

int find_coin(std::vector<int> b) {
    int g=0;
    for(int i=0;i<64;i++){
        if(b[i])g^=i;
    }
    return g;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<b.size();i++){
      |                 ~^~~~~~~~~

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