Submission #672211

#	Time	Username	Problem	Language	Result	Execution time	Memory
672211		Cutebol	K blocks (IZhO14_blocks)	C++17	100 / 100	182 ms	81048 KiB

blocks

#include <bits/stdc++.h>
 
using namespace std;
 
void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define Scaramouche ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define itn int
#define endl "\n"
#define ff first
#define ss second
   
const int N = 2e5 + 5 ;
const int mod = 1e9 + 7 ;
const int inf = 1e12 ;

int n , m ;
int a[N] ;
int dp[104][N] ;

void solve(){
	
	cin >> n >> m ;
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a[i] ;
	for ( int i = 1 ; i <= n ; i ++ ) dp[1][i] = max ( dp[1][i-1] , a[i] ) ;
	for ( int i = 2 ; i <= m ; i ++ )
		for ( int j = 1 ; j <= n; j ++ ) dp[i][j] = inf ;
	for ( int i = 2 ; i <= m ; i ++ ){
		stack <pair<int,int>> st ;
		for ( int j = i ; j <= n ; j ++ ){
			int last = dp[i-1][j-1] ;
			while ( !st.empty() && st.top().ff <= a[j] ){
				last =  min ( last , st.top().ss ) ;
				st.pop() ;
			}
			if ( st.empty() || st.top().ff + st.top().ss >= last + a[j] )
				st.push({a[j],last}) ;
			
			dp[i][j] = min ( last + a[j] , st.top().ff + st.top().ss ) ;
		}
	}
	cout << dp[m][n] ;
}
 
signed main(){
//  fopn("blocks") ;
//    Scaramouche ;
    int t = 1 ;
//      cin >> t ;
    while ( t -- ) solve() ; 
}

Compilation message (stderr)

blocks.cpp: In function 'void fopn(std::string)':
blocks.cpp:5:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:5:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 47 / 47