Submission #10437521

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Source Code Expand

#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i=(a); i<(int)(b); i++)
#define FORD(i, a, b) for (int i=a; i>(int)(b); i--)
#define PPC(x) __builtin_popcount(x)
#define MSB(x) (31 - __builtin_clz(x))
#define pb push_back
#define ALL(x) (x).begin(), (x).end()
#define ithBit(m, i) ((m) >> (i) & 1)
#define ft first
#define sd second
#ifdef DEBUG
#include "debug.h"
#else
#define dbg(...) 0
#endif
using namespace std;

const int maxN = 1 << 17;

bool vis[maxN];
char out[maxN];

void solve()
{
	int n, m;
	scanf ("%d%d", &n, &m);
	out[n] = 0;
	bool fail = false;
	while (m--)
	{
		int a, b;
		scanf ("%d%d", &a, &b);
		a--;
		if (vis[a] and (out[a] - '0') != b)
			fail = true;
		else
			out[a] = ('0' + b), vis[a] = true;
	}
	
	if (n != 1 and vis[0] and out[0] == '0')
		fail = true;
		
	FOR(i, 0, n)
	 	if (!vis[i])
	 		out[i] = i == 0 ? '1' : '0';
	 if (fail)
	 	printf("-1\n");
	 else
	 	printf("%s\n", out);
} 
 
int main()
{
    int t;
    t = 1;//scanf ("%d", &t);
    while (t--)
    	solve();
    return 0;    
}

Submission Info

Compile Error

./Main.cpp: In function ‘void solve()’:
./Main.cpp:27:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d", &n, &m);
                        ^
./Main.cpp:33:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d%d", &a, &b);
                         ^

Judge Result