Cyl

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这里写图片描述

思路：
这里写图片描述
一道简单的思维题，自己推吧。。。

#include <iostream>#include <cstdio>#include <algorithm>#include <cmath>using namespace std;int n, m;int stepn, stepm;int ans;int main(){    freopen ("cyl.in", "r", stdin);    freopen ("cyl.out", "w", stdout);    scanf("%d%d", &n, &m);    if( (n - 1) % 3 == 0 ){        stepn = (n - 1) / 3 * 2;        stepm = (m - 1) % 3 + (m - 1) / 3 * 2;        ans = stepn + stepm;    }    else if(n < 4){        if( (m - 1) % 3 == 0 ){            stepn = n - 1;            stepm = (m - 1) / 3 * 2;            ans = stepn + stepm;        }        else if(n == 3 && m == 3) ans = 8;        else if(n == 3){            if( (m - 1) % 3 == 0 ) ans = (m - 1) / 3 * 2 + 2;            else ans = (m - 1) / 3 * 2 + (m - 1) % 3 + 4;        }        else ans = -1;    }    else{        stepn = (n - 1) % 3 + (n - 1) / 3 * 2;        stepm = (m - 1) % 3 + (m - 1) / 3 * 2;        ans = stepn + stepm;    }    printf("%d", ans);    return 0;}

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