Submission #1515994

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Source Code Expand

#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define pb push_back
int dy[]={0, 0, 1, -1, 1, 1, -1, -1};
int dx[]={1, -1, 0, 0, 1, -1, -1, 1};
 
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define mp make_pair
#define fi first
#define sc second
int n,x,w[40];
 
int saiki(int i,int s){
    if(i == n){
        return s == 0;
    }
    if(s == 0)
        return 1;
    if(s < 0)
        return 0;
    if((n - i) * w[i] < s)
        return 0;
 
    return saiki(i + 1,s) + saiki(i + 1,s - w[i]);
}

int dp[2][20000001];
 
int main(){
    scanf("%d%d",&n,&x);
    REP(i,n)
        scanf("%d",w + i);
    sort(w,w + n,greater<int>());
    int s = 0;
    REP(i,n)
        s += w[i];
    if(s < x){
        printf("0\n");
        return 0;
    }else if(s == x){
        printf("1\n");
        return 0;
    }
    if(n < 27 || x > 20000000){
        printf("%d\n",saiki(0,x));
        return 0;
    }
    REP(i,x + 1)
        dp[1][i] = 0;
    dp[1][0] = 1;

    RREP(i,n){
        REP(j,x + 1){
            dp[0][j] = dp[1][j] + ((j - w[i] >= 0) ? dp[1][j - w[i]] : 0);
        }
        REP(j,x + 1)
            dp[1][j] = dp[0][j];
    }
    printf("%d\n",dp[1][x]);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:35:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&x);
                        ^
./Main.cpp:37:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",w + i);
                          ^

Judge Result