new file: P10815.cpp

P10815.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+void read(int &x) {
+    x = 0;
+    bool fu = 0;
+    char c = getchar_unlocked();
+    while ((c < '0' || c > '9') && c != '-')
+        c = getchar_unlocked();
+    if(c=='-') fu=1, c=getchar_unlocked();
+    while (c>='0' && c<='9'){
+        x = 10*x+c-'0', c = getchar_unlocked();
+    }
+    x=((fu)?-1:1)*x;
+}
+int main(){
+    int n, ans=0;
+    scanf("%d", &n);
+    for(int i = 1; i <= n; i++) {
+        int x;
+        read(x);
+        ans+=x;
+    }
+    printf("%d\n", ans);
+    return 0;
+}