Submission #8218

#	Time	Username	Problem	Language	Result	Execution time	Memory
8218		baneling100	스트랩 (JOI14_straps)	C++98	100 / 100	0 ms	1120 KiB

straps

#include <stdio.h>
#include <algorithm>
#define INF 0x7fffffff

using namespace std;

int T, N, M, A[2001], B[2001][2], D[2001], Ans, Sum, Cnt=1;

void input(void) {

    int i, X, Y;

    scanf("%d",&T);
    for(i=1 ; i<=T ; i++) {
        scanf("%d %d",&X,&Y);
        if(X) {
            if(Y>=0) {
                Sum+=Y;
                Cnt+=X-1;
            }
            else
                if(X>=2) {
                    B[++M][0]=X-1;
                    B[M][1]=Y;
                }
        }
        else
            if(Y>0)
                A[++N]=Y;
    }
    sort(A+1,A+N+1);
    for(i=N-1 ; i>=1 ; i--)
        A[i]+=A[i+1];
}

void process(void) {

    int i, j, k;

    for(i=1 ; i<=N-1 ; i++)
        D[i]=-INF;
    for(i=1 ; i<=M ; i++)
        for(j=N-1 ; j>=0 ; j--)
            if(D[j]!=-INF) {
                k=min(j+B[i][0],N-1);
                if(D[k]<D[j]+B[i][1])
                    D[k]=D[j]+B[i][1];
            }
    for(i=N-2 ; i>=0 ; i--)
        if(D[i]<D[i+1])
            D[i]=D[i+1];
    Ans=Sum;
    for(i=1 ; i<=N ; i++) {
        if(i<=Cnt) {
            if(Ans<Sum+A[N-i+1])
                Ans=Sum+A[N-i+1];
        }
        else
            if(Ans<Sum+D[i-Cnt]+A[N-i+1])
                Ans=Sum+D[i-Cnt]+A[N-i+1];
    }
}

void output(void) {

    printf("%d",Ans);
}

int main(void) {

    input();
    process();
    output();

    return 0;
}

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