Submission #1219100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219100		LM1	Coins (IOI17_coins)	C++20	Compilation error	0 ms	0 KiB

coins

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

using namespace std;
std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips;
    fr(i,0,8){
    	if(c&(1<<i)){
    		if(b[i]==0){
    			flips.pb(i);
			}
		}
		else{
			if(b[i]==1){
				flips.pb(i);
			}
		}
	}
	return flips;
}

int find_coin(std::vector<int> b) {
	int ans=0;
	fr(i,0,8){
		if(b[i])ans+=(1<<i);
	}
	return ans;
}

//static string run_test() {
//	int c;
//	cin >> c;
//	vector<int> b(64);
//	for (int i = 0; i < 8; i++) {
//		string s;
//		cin >> s;
//		for (int j = 0; j < 8; j++) {
//			b[i * 8 + j] = int(s[j] - '0');
//		}
//	}
//	vector<int> flips = coin_flips(b, c);
//	if ((int)flips.size() == 0) {
//		return "0 turn overs";
//	}
//	for (int i = 0; i < (int)flips.size(); i++) {
//		if (flips[i] < 0 || flips[i] > 63) {
//			return "cell number out of range";
//		}
//		b[flips[i]] = 1 - b[flips[i]];
//	}
//	int coin = find_coin(b);
//	if (coin != c) {
//		return "wrong coin";
//	}
//	return "ok";
//}
//
//int main() {
//	int tests;
//	cin >> tests;
//	for (int t = 1; t <= tests; t++) {
//		string result = run_test();
//		cout << "test #" << t << ": " << result << endl;
//	}
//	return 0;
//}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:9:8: error: 'i' was not declared in this scope
    9 |     fr(i,0,8){
      |        ^
coins.cpp:9:5: error: 'fr' was not declared in this scope
    9 |     fr(i,0,8){
      |     ^~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:26:12: error: 'i' was not declared in this scope
   26 |         fr(i,0,8){
      |            ^
coins.cpp:26:9: error: 'fr' was not declared in this scope
   26 |         fr(i,0,8){
      |         ^~