ATcode水题题解(持续更新)

AT_ddcc_2016_qual_a

题目传送门: Link

#include<cstdio>
using namespace std;
int a,b,c;
signed main(){
    scanf("%d%d%d",&a,&b,&c);
    printf("%.16lf",(double)b*(double)c/(double)a);
    return 0;
}

AT_abc056_a

题目传送门: Link

#include<cstdio>
using namespace std;
signed main(){
    char a,b;
    scanf("%c %c",&a,&b);
    a==b?printf("H\n"):printf("D\n");
    return 0;
}

AT_yahoo_procon2017_qual_b

题目传送门: Link

#include<cstdio>
#include<algorithm>
using namespace std;
const int N=1e5+7;
long long n,m,res,a[N];
int main(){
    scanf("%lld%lld",&n,&m);
    for(int i=0;i<n;i++) {
        scanf("%lld",&a[i]);
    }
    stable_sort(a,a+n);
    for(int i=0;i<m;i++){
        res+=i+a[i];
    }
    printf("%lld\n",res);
    return 0;
}

先写到这吧