传送门
排序！
#include <cstdio> #include <iostream> #include <algorithm> #define N 20001 int n; struct node a[N], b[N]; inline int read() inline bool cmp1(node x, node y) inline bool cmp2(node x, node y) int main() std::sort(a + 1, a + n + 1, cmp1); std::sort(b + 1, b + n + 1, cmp2); x = a[1].x + b[1].x; y = a[1].y + b[1].y; for(i = 2; i <= n; i++) if(a[i].x + b[i].x != x || a[i].y + b[i].y != y) x /= 2.0; y /= 2.0; printf("V.I.P. should stay at (%.1lf,%.1lf).\n", x, y); return 0; }
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