Submission #66568

#	Time	Username	Problem	Language	Result	Execution time	Memory
66568		ekrem	Ili (COI17_ili)	C++98	0 / 100	5 ms	4328 KiB

ili

#include <bits/stdc++.h>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define N 1000005
using namespace std;

int n, m, a[N], aa[N];
pair < int , int > g[N];

void yap(){
	for(int i = n + m; i > n; i--){
		if(a[i] == 0 and a[g[i].st] <= 0 and a[g[i].nd] <= 0){
			a[g[i].st] = 0;
			a[g[i].nd] = 0;
		}
		if(a[g[i].st] == 0 and a[g[i].nd] == 0 and a[i] != 1)
			a[i] = 0;
		if((a[g[i].st] == 1 or a[g[i].nd] == 1) and a[i] != 0)
			a[i] = 1;
		if(a[i] == 1 and a[g[i].st] == 0 and a[g[i].nd] != 0)
			a[g[i].nd] = 1;
		if(a[i] == 1 and a[g[i].nd] == 0 and a[g[i].st] != 0)
			a[g[i].st] = 1;
		// cout << a[i] << " -> " << a[g[i].st] << " , " << a[g[i].nd] << endl;
	}
}

bool bak(){
	for(int i = n + m; i > n; i--){
		if(a[i] == 0){
			if(a[g[i].st] == 1 or a[g[i].nd] == 1)return 0;
			a[g[i].st] = 0;
			a[g[i].nd] = 0;
		}
	}
	for(int i = n + m; i > n; i--){
		if(a[g[i].st] == 0 and a[g[i].nd] == 0){
			if(a[i] == 1)return 0;
			a[i] = 0;
		}
	}
	return 1;
}

int main() {
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);
	scanf("%d %d",&n ,&m);

	memset(a, -1, sizeof a);

	for(int i = 1; i <= m; i++){
		char x;
		scanf(" %c",&x);
		if(x == '1')
			a[i + n] = 1;
		if(x == '0')
			a[i + n] = 0;
	}

	for(int i = 1; i <= m; i++){
		int x, y;
		char aa, b;
		scanf(" %c%d %c%d",&aa ,&x ,&b ,&y);
		if(aa == 'c')
			x += n;
		if(b == 'c')
			y += n;
		g[i + n].st = x;
		g[i + n].nd = y;
		// cout << i + n << " -> " << x << " , " << y << endl;
		// cout << a[i + n] << " -> " << a[x] << " , " << a[y] << endl;
	}

	yap();

	for(int i = 1; i <= n + m; i++)
		aa[i] = a[i];

	// for(int i = n + 1; i <= n + m; i++)if(a[i] != -1)printf("%d",a[i]);else printf("?");puts("");
	for(int i = n + m; i > n; i--)
		if(a[i] == -1){
			for(int i = 1; i <= n + m; i++)
					a[i] = aa[i];
			a[i] = 0;
			// cout << i << " -> " << f << endl;
			// for(int i = n + 1; i <= n + m; i++)if(a[i] != -1)printf("%d",a[i]);else printf("?");puts("");
			if(!bak())
				aa[i] = 1;
		}
	for(int i = n + 1; i <= n + m; i++)
		if(aa[i] != -1)
			printf("%d",aa[i]);
		else
			printf("?");

	return 0;
}

Compilation message (stderr)

ili.cpp: In function 'int main()':
ili.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n ,&m);
  ~~~~~^~~~~~~~~~~~~~~~
ili.cpp:56:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c",&x);
   ~~~~~^~~~~~~~~~
ili.cpp:66:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c%d %c%d",&aa ,&x ,&b ,&y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 42
• Subtask 3: 0 / 51