Submission #106238

#	Time	Username	Problem	Language	Result	Execution time	Memory
106238		hamzqq9	Lun (COCI19_lun)	C++14	50 / 50	3 ms	384 KiB

lun

#include<bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define umax(x,y) x=max(x,y)
#define umin(x,y) x=min(x,y)
#define ll long long 
#define ii pair<int,int>
#define iii pair<ii,int>
#define iiii pair<ii,ii>
#define sz(x) ((int) x.size())
#define orta ((bas+son)/2)
#define all(x) x.begin(),x.end()
#define pw(x) (1<<(x))
#define inf 100000009
#define MOD 998244353
#define N 450
#define M 2500005
#define LOG 20
#define KOK 300
#define EPS 0.0000001
using namespace std;

int n;
char s[105];

bool valid(int val) {

	int sum=0;

	for(int i=1;i<n;i++) {

		int cur=(s[i]=='x'?val:s[i]-'0');

		if((n-i+1)&1) {

			sum+=cur;

		}
		else {

			cur<<=1;

			sum+=cur%10;	
			sum+=cur/10;

		}

	} 

	sum=sum*9%10;

	int last=(s[n]=='x'?val:s[n]-'0');

	return last==sum;

}

int main() {

	scanf("%d",&n);

	scanf("%s",s+1);

	for(int i=0;i<10;i++) {

		if(valid(i)) {

			printf("%d",i);

			return 0;

		}

	}

}

Compilation message (stderr)

lun.cpp: In function 'int main()':
lun.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
lun.cpp:66:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",s+1);
  ~~~~~^~~~~~~~~~

• Subtask 1: 50 / 50