Submission #672207

#TimeUsernameProblemLanguageResultExecution timeMemory
672207CutebolK blocks (IZhO14_blocks)C++17
0 / 100
1 ms340 KiB
#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 <= 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);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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