CodeForces - 864C Bus 水模拟

直接模拟?

水题

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define PI acos(-1.0)
#define in freopen("in.txt", "r", stdin)
#define out freopen("out.txt", "w", stdout)
using namespace std;
typedef long long ll;
const int maxn = 200000 + 7, INF = 0x3f3f3f3f, mod = 1e9 + 7;
int aa, b, ff, k, ans;
int a[maxn];

int main() {
    scanf("%d %d %d %d", &aa, &b, &ff, &k);
    int n = k+1, f = 1;
    int t1 = 2*ff, t2 = 2*(aa-ff);
    a[1] = t1 / 2; f = 1-f;
    for(int i = 2; i < n; ++i) {
        if(f) {
            a[i] = t1;
            f = 1-f;
        }
        else {
            a[i] = t2;
            f = 1-f;
        }
    }
    if(f) a[n] = t1/2;
    else a[n] = t2/2;
    int c = b;

    for(int i = 1; i <= n; ++i) {
        //cout << a[i] << " == " << endl;
        if(c < a[i]) {
            c = b-a[i];
            ans++;
        }
        else {
            c -= a[i];
        }
        if(c < 0) { printf("-1\n"); return 0; }
    }
    printf("%d\n", ans);

    return 0;
}


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