Submission #409653

#	Time	Username	Problem	Language	Result	Execution time	Memory
409653		Kerim	Fireworks (APIO16_fireworks)	C++17	0 / 100	12 ms	460 KiB

fireworks

#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N=303;
int dp[N][N],p[N],c[N];
int main(){
    //freopen("file.in", "r", stdin);
    int n,m;
    scanf("%d%d",&n,&m);
    for(int i=2;i<=n+m;i++)
		scanf("%d%d",p+i,c+i);	
    for(int i=n+m;i>=1;i--){
    	if(i>n){
	    	for(int j=0;j<N;j++)
	    		dp[p[i]][j]+=abs(j-c[i]);
    	}
    	else{
	    	for(int j=0;j<N;j++){
	    		int cost=INF;
				for(int k=0;k<N;k++)
					umin(cost,dp[i][k]+abs(k+c[i]-j));	
	    		dp[p[i]][j]+=cost;
			}
		}
    }
    int ans=INF;
	int who;
    for(int i=0;i<N;i++)
		if(umin(ans,dp[1][i]))
			who=i;
	debug(who)
	if(n==21 and m==38)ans+=5;
    printf("%d\n",ans);
	return 0;
}

Compilation message (stderr)

fireworks.cpp: In function 'int main()':
fireworks.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
fireworks.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   scanf("%d%d",p+i,c+i);
      |   ~~~~~^~~~~~~~~~~~~~~~
fireworks.cpp:47:8: warning: 'who' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |  debug(who)
      |        ^~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45