Submission #882297

#	Time	Username	Problem	Language	Result	Execution time	Memory
882297		Requiem	Potatoes and fertilizers (LMIO19_bulves)	C++17	24 / 100	69 ms	13144 KiB

bulves

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define MOD 1000000007
#define INF 1e18
#define fi first
#define se second
#define endl "\n"
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define sz(a) ((int)(a).size())
#define pi 3.14159265359
#define TASKNAME "bulves"
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; } 
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; } 
using namespace std; 
typedef pair<int,int> ii; 
typedef pair<int,ii> iii; 
typedef vector<int> vi; 
const int MAXN = 5e5 + 9;
int n;
int a[MAXN],b[MAXN],A,B;
main() 
{ 
    fast; 
   if (fopen(TASKNAME".inp","r")){
        freopen(TASKNAME".inp","r",stdin); 
        freopen(TASKNAME".out","w",stdout); 
   }
   cin>>n;
   for(int i=1;i<=n;i++){
       cin>>a[i]>>b[i];
       A += a[i];
       B += b[i];
   } 
   if (A == B){
       int ans = 0, bring = 0;
       for(int i=1;i<=n;i++){
           ans += abs(bring);
           if (a[i] == b[i]) continue;
           if (a[i] < b[i]) bring -= b[i] - a[i];
           else bring += a[i] - b[i];
       }
       cout<<ans<<endl;
   }
} 

Compilation message (stderr)

bulves.cpp:24:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   24 | main()
      | ^~~~
bulves.cpp: In function 'int main()':
bulves.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(TASKNAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bulves.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen(TASKNAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 24 / 24
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 36