Submission #1205026

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Source Code Expand

#include <algorithm>  
#include <iostream>  
#include <sstream>  
#include <string>  
#include <cstring>
#include <vector>  
#include <queue>  
#include <set>  
#include <map>  
#include <cstdio>  
#include <cstdlib>  
#include <cctype>  
#include <cmath>  
#include <list>  
#include <cassert>
#include <ctime>
#include <climits>
using namespace std;  

#define PB push_back  
#define MP make_pair  
#define SZ(v) ((int)(v).size())  
#define FOR(i,a,b) for(int i=(a);i<(b);++i)  
#define REP(i,n) FOR(i,0,n)  
#define FORE(i,a,b) for(int i=(a);i<=(b);++i)  
#define REPE(i,n) FORE(i,0,n)  
#define FORSZ(i,a,v) FOR(i,a,SZ(v))  
#define REPSZ(i,v) REP(i,SZ(v))  
typedef long long ll;
typedef unsigned long long ull;
ll gcd(ll a,ll b) { return b==0?a:gcd(b,a%b); }

const int MAXNB=50;
const int MAXNA=2*MAXNB-1;
const int MOD=1000000007;

int na,nb;
int a[MAXNA];

int mem[MAXNB+1][MAXNA+1][MAXNA+1];

int go(int sufflen,int prefopt,int curidx) {
	int &ret=mem[sufflen][prefopt][curidx];
	if(ret==-1) {
		int oprefopt=prefopt,ocuridx=curidx;
		if(sufflen==nb) return ret=1;
		if(a[nb-sufflen-1]!=a[nb-sufflen]) ++prefopt,++curidx;
		if(a[nb+sufflen-1]!=a[nb+sufflen-2]) ++prefopt;
		ret=0;
		REP(i,prefopt) {
			int nprefopt=prefopt; if(i<curidx) nprefopt-=abs(curidx-1-i); if(i>curidx) nprefopt-=abs(i-curidx-1);
			ret=(ret+go(sufflen+1,nprefopt,i<=curidx?i:curidx+1))%MOD;
		}
		//REP(i,sufflen-1) printf(" "); printf("go(%d,%d,%d)=%d [%d,%d]\n",sufflen,oprefopt,ocuridx,ret,prefopt,curidx);
	}
	return ret;
}


void run() {
	scanf("%d",&nb); na=2*nb-1;
	REP(i,na) scanf("%d",&a[i]); sort(a,a+na);
	memset(mem,-1,sizeof(mem));
	int ret=go(1,1,0);
	printf("%d\n",ret);
}

int main() {
	run();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void run()’:
./Main.cpp:61:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&nb); na=2*nb-1;
                 ^
./Main.cpp:62:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i,na) scanf("%d",&a[i]); sort(a,a+na);
                             ^

Judge Result