Submission #864089

#	Time	Username	Problem	Language	Result	Execution time	Memory
864089		nguyentunglam	Coins (IOI17_coins)	C++17	0 / 100	2 ms	1116 KiB

coins

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

std::vector<int> coin_flips(std::vector<int> b, int c) {

   int sum = 0;
   for(int i = 0; i < b.size(); i++) if (b[i]) sum += i;
   
   for (int i = 0; i < b.size(); i++) {
       if (b[i]) sum -= i;
       else sum += i;
       
       if (sum % b.size() == c) return {i}; 
       
       if (b[i]) sum += i;
       else sum -= i;
   }

   assert(false);
}

int find_coin(std::vector<int> b) {
   int ret = 0;
   for(int i = 0; i < b.size(); i++) if (b[i]) ret += i;
   return ret % b.size();
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:8:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |    for(int i = 0; i < b.size(); i++) if (b[i]) sum += i;
      |                   ~~^~~~~~~~~~
coins.cpp:10:22: 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++) {
      |                    ~~^~~~~~~~~~
coins.cpp:14:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   14 |        if (sum % b.size() == c) return {i};
      |            ~~~~~~~~~~~~~~~^~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:25:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |    for(int i = 0; i < b.size(); i++) if (b[i]) ret += i;
      |                   ~~^~~~~~~~~~

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