Submission #46856

#	Time	Username	Problem	Language	Result	Execution time	Memory
46856		ffresh	스트랩 (JOI14_straps)	C++17	100 / 100	13 ms	760 KiB

straps

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int N = 2005,inf = -2e9-150;

int dp[N];

pair<int,int> inp[N];
int main(){
    //freopen("input.txt","r",stdin);

    int n;
    scanf("%d",&n);

    int a,b,ret=0;
    
    for(int i=0;i<N;++i)dp[i]= inf;
    dp[1]= 0;
    
    for(int i=0;i<n;++i){
        scanf("%d%d",&inp[i].first,&inp[i].second);
    }
    sort(inp,inp+n,greater<pair<int,int> >());

    for(int i=0;i<n;++i){
        int x = inp[i].first-1, y = inp[i].second;

        if(x<0){
            for(int j=1;j<=n;++j)
                if(dp[j]!=inf)dp[j-1]= max(dp[j-1],dp[j]+y);
        }
        else{
            for(int j=n;j>=1;--j){
                int nj = min(n,j+x);
                if(dp[j]!=inf)
                    dp[nj]= max(dp[nj], dp[j] + y);
            }
        }
    }

    for(int i=0;i<=n;++i)ret= max(ret,dp[i]);
    printf("%d\n",ret);
    return 0;
}

Compilation message (stderr)

straps.cpp: In function 'int main()':
straps.cpp:18:9: warning: unused variable 'a' [-Wunused-variable]
     int a,b,ret=0;
         ^
straps.cpp:18:11: warning: unused variable 'b' [-Wunused-variable]
     int a,b,ret=0;
           ^
straps.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
straps.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&inp[i].first,&inp[i].second);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 45 / 45
• Subtask 4: 45 / 45