Submission #407117

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
407117	2021-05-18 13:51:40	79brue	Security Gate (JOI18_security_gate)	C++14	30 / 100	5021 ms	324 KiB

securitygate

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int n;
char s[102];
int pref[102];
int ans;
void dfs(int x){
    if(x == n+1){
        int firstNegative = 101, lastNegative = -1;
        for(int i=1; i<=n; i++) if(pref[i] < 0) firstNegative = min(firstNegative, i);
        for(int i=1; i<=n; i++) if(pref[i] - pref[n] < 0) lastNegative = i;
        if(pref[n] == 0 && lastNegative == -1){
            ans++;
            return;
        }
        bool able = 0;
        for(int i=1; i<=n && i<=firstNegative; i++){
            bool good = 0;
            for(int j=i; j<=n; j++){
                if(pref[j] > 2 * pref[i-1]) break;
                if(pref[n] - 2 * (pref[j] - pref[i-1]) == 0 && j > lastNegative){
                    good = 1;
                    break;
 
 
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Compilation message (stderr)

securitygate.cpp: In function 'int main()':
securitygate.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |     scanf("%d %s", &n, s+1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 0 / 43
• Subtask 5: 0 / 27