2103. 环和杆

class Solution:
    def countPoints(self, rings: str) -> int:
        mask = [0] * 10
        d = {"R": 1, "G": 2, "B": 4}
        for i in range(0, len(rings), 2):
            c = rings[i]
            j = int(rings[i + 1])
            mask[j] |= d[c]
        return mask.count(7)

class Solution {
    public int countPoints(String rings) {
        int[] d = new int['Z'];
        d['R'] = 1;
        d['G'] = 2;
        d['B'] = 4;
        int[] mask = new int[10];
        for (int i = 0, n = rings.length(); i < n; i += 2) {
            int c = rings.charAt(i);
            int j = rings.charAt(i + 1) - '0';
            mask[j] |= d[c];
        }
        int ans = 0;
        for (int x : mask) {
            if (x == 7) {
                ++ans;
            }
        }
        return ans;
    }
}

class Solution {
public:
    int countPoints(string rings) {
        int d['Z']{['R'] = 1, ['G'] = 2, ['B'] = 4};
        int mask[10]{};
        for (int i = 0, n = rings.size(); i < n; i += 2) {
            int c = rings[i];
            int j = rings[i + 1] - '0';
            mask[j] |= d[c];
        }
        return count(mask, mask + 10, 7);
    }
};

func countPoints(rings string) (ans int) {
	d := ['Z']int{'R': 1, 'G': 2, 'B': 4}
	mask := [10]int{}
	for i, n := 0, len(rings); i < n; i += 2 {
		c := rings[i]
		j := int(rings[i+1] - '0')
		mask[j] |= d[c]
	}
	for _, x := range mask {
		if x == 7 {
			ans++
		}
	}
	return
}

function countPoints(rings: string): number {
    const idx = (c: string) => c.charCodeAt(0) - 'A'.charCodeAt(0);
    const d: number[] = Array(26).fill(0);
    d[idx('R')] = 1;
    d[idx('G')] = 2;
    d[idx('B')] = 4;
    const mask: number[] = Array(10).fill(0);
    for (let i = 0; i < rings.length; i += 2) {
        const c = rings[i];
        const j = rings[i + 1].charCodeAt(0) - '0'.charCodeAt(0);
        mask[j] |= d[idx(c)];
    }
    return mask.filter(x => x === 7).length;
}

impl Solution {
    pub fn count_points(rings: String) -> i32 {
        let mut d: [i32; 90] = [0; 90];
        d['R' as usize] = 1;
        d['G' as usize] = 2;
        d['B' as usize] = 4;

        let mut mask: [i32; 10] = [0; 10];

        let cs: Vec<char> = rings.chars().collect();

        for i in (0..cs.len()).step_by(2) {
            let c = cs[i] as usize;
            let j = (cs[i + 1] as usize) - ('0' as usize);
            mask[j] |= d[c];
        }

        mask
            .iter()
            .filter(|&&x| x == 7)
            .count() as i32
    }
}

int countPoints(char* rings) {
    int d['Z'];
    memset(d, 0, sizeof(d));
    d['R'] = 1;
    d['G'] = 2;
    d['B'] = 4;

    int mask[10];
    memset(mask, 0, sizeof(mask));

    for (int i = 0, n = strlen(rings); i < n; i += 2) {
        int c = rings[i];
        int j = rings[i + 1] - '0';
        mask[j] |= d[c];
    }

    int ans = 0;
    for (int i = 0; i < 10; i++) {
        if (mask[i] == 7) {
            ans++;
        }
    }

    return ans;
}

function countPoints(rings: string): number {
    let c = 0;
    for (let i = 0; i <= 9; i++) {
        if (rings.includes('B' + i) && rings.includes('R' + i) && rings.includes('G' + i)) c++;
    }
    return c;
}