ccf csp 201812-2 小明放学

因为不知道红绿灯顺序错了几次Orz

#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll r,y,g,n;
//红绿灯顺序是红绿黄！！！
void check(ll & t, ll a, ll b, ll mod)
{
    if(a == 1)//r
    {
        ll tt = (r - b + t) % mod;
        if(tt < r) t +=  r - tt;
        else if( tt < r + g) {}
        else t += mod - tt + r;
    }else if( a == 2)//y
    {
        ll tt = (y - b + t) % mod;
        if(tt < y) t += y - tt + r;
        else if(tt < y + r) { t += y + r - tt;}
    }else if(a == 3)//g
    {
        ll tt = (g - b + t) % mod;
        if(tt < g){}
        else if(tt < g + y) t += g + y - tt + r;
        else t += g + y - tt + r;
    }
}
int main()
{
    freopen("in.txt","r",stdin);
    ios::sync_with_stdio(false);
    cin>>r>>y>>g>>n;
    ll mod = r + y + g;
    ll t = 0;
    while(n--)
    {
        ll a,b;
        cin>>a>>b;
        if(a == 0){
            t += b;
        }
        else
        {
            check(t,a,b,mod);
        }
    }
    cout<<t<<endl;
    return 0;
}