Submission #137940

#	Time	Username	Problem	Language	Result	Execution time	Memory
137940		zoooma13	Cake 3 (JOI19_cake3)	C++14	0 / 100	35 ms	31736 KiB

cake3

#include <bits/stdc++.h>
using namespace std;

#define MAX_N 2003
#define INF 0x3f3f3f3f3f3f3f3f
#define c first
#define v second

int n ,m;
pair<int ,int> piece[MAX_N];

long long dp[MAX_N][MAX_N];
long long solve(int p ,int l){
    if(l == 0)
        return -2LL*piece[p-1].c;
    if(p == n)
        return -INF;

    auto&ret = dp[p][l];
    if(~ret)
        return ret;
    return ret = max(piece[p].v+solve(p+1 ,l-1) ,solve(p+1 ,l));
}

int main()
{
    scanf("%d%d",&n,&m); assert(n < MAX_N);
    for(int i=0; i<n; i++)
        scanf("%d%d",&piece[i].v,&piece[i].c);
    sort(piece ,piece+n);

    memset(dp ,-1 ,sizeof dp);
    long long ans = 0LL;
    for(int i=0; i<n; i++)
        ans = max(ans ,solve(i+1 ,m-1)+piece[i].v+2LL*piece[i].c);
    printf("%lld\n",ans);
}

Compilation message (stderr)

cake3.cpp: In function 'int main()':
cake3.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m); assert(n < MAX_N);
     ~~~~~^~~~~~~~~~~~~~
cake3.cpp:29:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&piece[i].v,&piece[i].c);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 19
• Subtask 3: 0 / 76