Submission #1091448

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091448		Almonther	Coins (IOI17_coins)	C++17	100 / 100	9 ms	1952 KiB

coins

#include <bits/stdc++.h>
#define suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define co cout<<
//#pragma GCC optimize("O3,Ofast,unroll-loops")
//#pragma GCC target("avx2,sse3,sse4,avx")
using namespace std;
//stuff
vector<int>coin_flips(vector<int>b, int c){
    ll num=0;
    for(int i=0;i<b.size();i++){
        if(b[i]) num^=i;
    }
    for(int i=0;i<b.size();i++){
        if((num^i)==c){
            return {i};
        }
    }
}
int find_coin(vector<int>b){
    int ans=0;
    for(int i=0;i<b.size();i++){
        if(b[i]) ans^=i;
    }
    return ans;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i=0;i<b.size();i++){
      |                 ~^~~~~~~~~
coins.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<b.size();i++){
      |                 ~^~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:22:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for(int i=0;i<b.size();i++){
      |                 ~^~~~~~~~~
coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type]
   19 | }
      | ^

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