Submission #1072714

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cstdlib>
#include <set>
#include <queue>
using namespace std;

#define X first
#define Y second
#define N 100010
typedef long long ll;
typedef pair<int,int> pii;
const int Mod=1000000007;

const double INF=1e18;

int n;
int a[N];
ll s[N],f[N];

int main()
{
	//freopen("in.in","r",stdin);
	//freopen("out.out","w",stdout);
	
	scanf("%d",&n);  scanf("%d",&a[1]); s[1]=a[1];
	for (int i=2;i<=n;i++)
	{
		char op; scanf(" %c",&op);
		scanf("%d",&a[i]);
		if (op=='-') a[i]=-a[i];
		s[i]=a[i]+s[i-1];
	}
	
	f[n]=a[n];
	ll mx=-s[n];
	for (int i=n-1;i>=1;i--)
	{
		if (a[i]<0) 
		{
			f[i]=a[i]+f[i+1];
			f[i]=max(f[i],a[i]+s[i]+mx);
		}
		else f[i]=a[i]+f[i+1];
		mx=max(mx,f[i+1]-s[i]);
		//cout<<i<<" "<<f[i]<<" "<<a[i]<<" "<<s[i]<<" "<<mx<<endl;
	}
	cout<<f[1]<<endl;
	return 0;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);  scanf("%d",&a[1]); s[1]=a[1];
                ^
./Main.cpp:31:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);  scanf("%d",&a[1]); s[1]=a[1];
                                    ^
./Main.cpp:34:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   char op; scanf(" %c",&op);
                            ^
./Main.cpp:35:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
                    ^

Judge Result