Submission #1038165

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038165		Hanksburger	Coins (IOI17_coins)	C++17	0 / 100	1 ms	1124 KiB

coins

#include "coins.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> coin_flips(vector<int> b, int c)
{
    int s=0, t=0;
    for (int i=0; i<b.size(); i++)
        s+=b[i], t+=i*b[i];
    for (int i=0; i<b.size(); i++)
		if (((1-(s+1-b[i]*2)%4/2*2)*(t+(1-b[i]*2)*i)+6400)%64==c)
			return vector<int>(1, i);
}
int find_coin(vector<int> b)
{
    int s=0, t=0;
    for (int i=0; i<b.size(); i++)
        s+=b[i], t+=i*b[i];
    return ((1-s%4/2*2)*t+6400)%64;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:7:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |     for (int i=0; i<b.size(); i++)
      |                   ~^~~~~~~~~
coins.cpp:9:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for (int i=0; i<b.size(); i++)
      |                   ~^~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:16:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int i=0; i<b.size(); i++)
      |                   ~^~~~~~~~~
coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:12:1: warning: control reaches end of non-void function [-Wreturn-type]
   12 | }
      | ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 50