link: http://codeforces.com/contest/330/problem/A
brute force.
1 /* 2 ID: zypz4571 3 LANG: C++ 4 TASK: 191a.cpp 5 */ 6 7 #include <cstdio> 8 #include <cstdlib> 9 #include <cstring> 10 #include <cmath> 11 #include <cctype> 12 #include <algorithm> 13 #include <queue> 14 #include <set> 15 #include <queue> 16 #include <list> 17 #include <map> 18 #define INF 0x3f3f3f3f 19 #define mid int m=(l+r)/2 20 using namespace std; 21 int a[102]; 22 int main ( int argc, char *argv[] ) 23 { 24 #ifndef ONLINE_JUDGE 25 freopen("191a.in", "r", stdin); 26 #endif 27 int n, n1=0, cnt=0, Max=0; scanf("%d", &n); 28 for (int i=0; i<n; ++i){ 29 scanf("%d",a+i); if(a[i]) n1++; 30 } 31 if (n1 == n) Max = n1-1; 32 else 33 { 34 Max = n1; 35 for (int i=0; i<n; ++i) { 36 for (int j=0; j<n; ++j) { 37 cnt = n1; 38 for (int k=i; k<=j; ++k) { 39 if (!a[k]) cnt++; else cnt--; 40 } 41 if (cnt > Max) Max = cnt; 42 } 43 } 44 } 45 printf("%d\n", Max); 46 47 return EXIT_SUCCESS; 48 } /* ---------- end of function main ---------- */
It is so easy. However, I got a WA at first. sad......
