AtCoder Beginner Contest 158

Posted 2020-11-26 zdragon1104

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A - Station and Bus

#include <bits/stdc++.h>
using namespace std;
char s[5];
int main() {
    //freopen("in.txt","r",stdin);
    scanf("%s",s);
    int a=0,b=0;
    for(int i=0;s[i];i++) {
        if(s[i]==‘A‘) a++;
        else b++;
    }
    printf("%s
",a&&b?"Yes":"No");
    return 0;
}

A.cpp

B - Count Balls

#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main() {
    //freopen("in.txt","r",stdin);
    ll n,a,b;
    scanf("%lld%lld%lld",&n,&a,&b);
    printf("%lld
",n/(a+b)*a+min(n%(a+b),a));
    return 0;
}

B.cpp

C - Tax Increase

题意：找到最小的正整数x，满足$left lfloor x*0.08 ight floor = A$并且$left lfloor x*0.1 ight floor = B$，若不存在，输出-1。

数据范围：1<=A<=B<=100。

题解：暴力枚举x判断即可，至少要枚举到1000。

#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main() {
    //freopen("in.txt","r",stdin);
    int a,b;
    scanf("%d%d",&a,&b);
    bool f=false;
    for(int i=1;i<=1500;i++) {
        if(i*8/100==a&&i/10==b) {
            printf("%d
",i);
            f=true;
            break;
        }
    }
    if(!f) printf("-1
");
    return 0;
}

C.cpp

D - String Formation