关于c++:二分

整数二分算法

bool check(int x) {/* ... */} // 查看x是否满足某种性质// 区间[l, r]被划分成[l, mid]和[mid + 1, r]时应用：int bsearch_1(int l, int r) {    while (l < r) {        int mid = l + r >> 1;        if (check(mid)) r = mid;        else l = mid + 1;    }        return l;}// 区间[l, r]被划分成[l, mid - 1]和[mid, r]时应用：int bsearch_2(int l, int r) {    while (l < r) {        int mid = l + r + 1 >> 1;        if (check(mid)) l = mid;        else r = mid - 1;    }        return l;}

浮点数二分算法

bool check(double x) {/* ... */} // 查看x是否满足某种性质double bsearch_3(double l, double r) {    const double eps = 1e-6; // eps示意精度，取决于题目对精度的要求    while (r - l > eps) {        double mid = (l + r) / 2;        if (check(mid)) r = mid;        else l = mid;    }        return l;}