56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
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function equalTo24(a,b,c,d) {
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// const ops = [
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// (a, b) => a + b,
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// (a, b) => a - b,
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// (a, b) => a * b,
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// (a, b) => a / b
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// ];
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const ops = [
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(a, b) => `(${a}+${b})`,
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(a, b) => `(${a}-${b})`,
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(a, b) => `(${a}*${b})`,
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(a, b) => `(${a}/${b})`,
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];
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const opsLen = ops.length;
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const arr = [a, b, c, d];
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let res = [];
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for (let i = 0; i < 3; ++i) {
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for (let iop = 0; iop < opsLen; ++iop) {
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for (let j = 0; j < 2; ++j) {
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for (let jop = 0; jop < opsLen; ++jop) {
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for (let kop = 0; kop < opsLen; ++kop) {
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let n = [...arr.slice(0, i), ops[iop](arr[i], arr[i+1]), ...arr.slice(i+2)];
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n = [...n.slice(0, j), ops[jop](n[j], n[j+1]), ...n.slice(j+2)];
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const resStr = ops[kop](n[0], n[1]);
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if (eval(resStr) === 24) {
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res.push(resStr);
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}
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}
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}
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}
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}
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}
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return res;
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}
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let res = [];
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for (let i = 1; i <= 13; ++i) {
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for (let j = 1; j <= 13; ++j) {
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for (let k = 1; k <= 13; ++k) {
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for (let l = 1; l <= 13; ++l) {
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let arr = [i, j, k, l];
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arr.sort((a, b) => a - b);
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let codes = equalTo24(i, j, k, l);
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if (codes.length) {
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if (!res[arr[0]]) res[arr[0]] = [];
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if (!res[arr[0]][arr[1]]) res[arr[0]][arr[1]] = [];
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if (!res[arr[0]][arr[1]][arr[2]]) res[arr[0]][arr[1]][arr[2]] = [];
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if (!res[arr[0]][arr[1]][arr[2]][arr[3]]) res[arr[0]][arr[1]][arr[2]][arr[3]] = codes[0];
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}
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}
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}
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}
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}
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