CODE FESTIVAL 2016 qual B B - Qualification simulator

備忘録

問題

atcoder.jp

回答

import sys
import os
import math
import bisect
import itertools
import collections
import heapq
import queue
import array
import time
import numpy as np
from numpy import linalg as LA

# 時々使う
# import numpy as np
# from decimal import Decimal, ROUND_HALF_UP
# from scipy.sparse.csgraph import csgraph_from_dense, floyd_warshall
# from collections import defaultdict, deque

# 再帰の制限設定
sys.setrecursionlimit(10000000)


def ii(): return int(sys.stdin.buffer.readline().rstrip())
def il(): return list(map(int, sys.stdin.buffer.readline().split()))
def fl(): return list(map(float, sys.stdin.buffer.readline().split()))
def iln(n): return [int(sys.stdin.buffer.readline().rstrip())
                    for _ in range(n)]


def iss(): return sys.stdin.buffer.readline().decode().rstrip()
def sl(): return list(map(str, sys.stdin.buffer.readline().decode().split()))
def isn(n): return [sys.stdin.buffer.readline().decode().rstrip()
                    for _ in range(n)]


def lcm(x, y): return (x * y) // math.gcd(x, y)


# MOD = 10 ** 9 + 7
MOD = 998244353
INF = float('inf')


def f(N):
    if N <= 2:
        return N
    return N * f(N-2)


def main():
    if os.getenv("LOCAL"):
        sys.stdin = open("input.txt", "r")

    N, A, B = il()
    S = iss()

    qua_pass = 0
    student = 0
    for i in range(N):
        if S[i] == 'b':
            student += 1
        if S[i] == 'a' and A + B > qua_pass:
            qua_pass += 1
            print('Yes')
        elif S[i] == 'b' and A + B > qua_pass and B >= student:
            qua_pass += 1
            print('Yes')
        else:
            print('No')


if __name__ == '__main__':
    main()

回答

予選を通過した学生の数と海外の学生の数をそれぞれカウントして、
愚直に指示通りの判定を行います。