Submission #249258

#	Time	Username	Problem	Language	Result	Execution time	Memory
249258		blacktulip	Shell (info1cup18_shell)	C++17	100 / 100	969 ms	63584 KiB

shell

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long lo;
typedef pair< lo,lo > PII;
 
#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define int long long
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)
 
const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;
 
int n,m,b[li],a[li],k,flag,t;
int cev;
map<int,int> mpp;
string s;
map<pair<int,int>,int> dp;
vector<int> v[li];
 
inline int add(int x,int y){
	if(x+y>=mod)return x+y-mod;
	return x+y;
}
 
inline int f(int sira,int num){
	int cevv=0;
	if(sira==n){
		if(num<=k)return 0;
		return 1;
	}
	if(dp.find(mp(sira,num))!=dp.end())return dp[mp(sira,num)];
	for(int i=0;i<(int)v[sira].size();i++){
		int go=v[sira][i];
		if(mpp[go] && mpp[go]!=num)continue;
		cevv=add(cevv,f(go,num+(go==a[num]?1:0)));
	}
	return dp[mp(sira,num)]=cevv;
}
 
main(void){
	//~ memset(dp,-1,sizeof(dp));
	scanf("%lld %lld %lld",&n,&m,&k);
	for(int i=1;i<=k;i++){
		scanf("%lld",&a[i]);
		mpp[a[i]]=i;
	}
	for(int i=1;i<=m;i++){
		int x,y;
		scanf("%lld %lld",&x,&y);
		v[x].pb(y);
	}
	printf("%lld\n",f(1,1+(a[1]==1?1:0)));
	return 0;
}

Compilation message (stderr)

shell.cpp:52:10: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(void){
          ^
shell.cpp: In function 'int main()':
shell.cpp:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld",&n,&m,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
shell.cpp:56:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&a[i]);
   ~~~~~^~~~~~~~~~~~~~
shell.cpp:61:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld",&x,&y);
   ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 45 / 45
• Subtask 3: 20 / 20
• Subtask 4: 25 / 25