Submission #118433

#	Time	Username	Problem	Language	Result	Execution time	Memory
118433		str0ct	화살표 그리기 (KOI18_arrowH)	C++14	0 / 100	2 ms	1152 KiB

arrow

#include<bits/stdc++.h>
using namespace std;
long long ipt[101010],w[101010],color[101010],opt[101010],sum;
int main(){
    int N;
    scanf("%d",&N);
    for(int i=0;i<N;i++)
        scanf("%lld%lld",&w[i],&ipt[i]);
    memset(color,-1,sizeof(color));
    for(int i=0;i<N;i++){
        if(color[ipt[i]]!=-1)
            opt[i]=w[i]-color[ipt[i]];
        color[ipt[i]]=w[i];
    }
    memset(color,-1,sizeof(color));
    for(int i=N-1;i>=0;i--){
        if(color[ipt[i]]!=-1&&(opt[i]==0||opt[i]>color[ipt[i]]-w[i]))
            opt[i]=color[ipt[i]]-w[i];
        color[ipt[i]]=w[i];
    }
    for(int i=0;i<N;i++)
        sum+=opt[i];
    printf("%lld",sum);
}

Compilation message (stderr)

arrow.cpp: In function 'int main()':
arrow.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
     ~~~~~^~~~~~~~~
arrow.cpp:8:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld",&w[i],&ipt[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 21
• Subtask 2: 0 / 12
• Subtask 3: 0 / 29
• Subtask 4: 0 / 38