'commit'

TangDou/LuoGuBook/P1161.cpp

@@ -0,0 +1,25 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+const int N = 2000010;
+int b[N];   //灯的状态
+double a;   //1-1000的实数
+int n;      //操作数量
+int t;      //倍数
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a >> t;
+        for (int j = 1; j <= t; j++) {
+            int x = a * j;
+            b[x] = !b[x];
+        }
+    }
+    for (int i = 1; i < N; i++)
+        if (b[i]) {
+            printf("%d ", i);
+            break;
+        }
+    return 0;
+}