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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int N, altitude;
  6.     cin >> N;
  7.     cin >> altitude;
  8.     int prev_altitude = altitude;
  9.     cin >> altitude;
  10.     int current_altitude = altitude, test_asc = 0, test_top = 0, test_desc = 0, test_mountain = 0, double_check = 1;
  11.     if (N == 3) {
  12.         cin >> altitude;
  13.         if (prev_altitude < current_altitude && current_altitude > altitude) {
  14.             test_mountain = 1;
  15.         }
  16.     } else {
  17.         int i = 2;
  18.         while (i < N) {
  19.             if (current_altitude > prev_altitude) {
  20.                 test_asc = 1;
  21.             } else if (test_top == 0 && current_altitude <= prev_altitude) {
  22.                 double_check = 0;
  23.             }
  24.             cin >> altitude;
  25.             if (test_asc == 1 && current_altitude > altitude) {
  26.                 test_top = 1;
  27.                 if (i == N - 1) {
  28.                     test_mountain = 1;
  29.                 }
  30.             }
  31.             if (test_top == 1 && current_altitude < prev_altitude) {
  32.                 test_desc = 1;
  33.             }
  34.             if (test_desc == 1 && current_altitude > altitude) {
  35.                 test_mountain = 1;
  36.             } else if (test_desc == 1 && current_altitude <= altitude) {
  37.                 double_check = 0;
  38.             }
  39.             prev_altitude = current_altitude;
  40.             current_altitude = altitude;
  41.             ++i;
  42.         }
  43.     }
  44.     if (test_mountain == 1 && double_check == 1) {
  45.         cout << 1;
  46.     } else {
  47.         cout << 0;
  48.     }
  49.     return 0;
  50. }
Success #stdin #stdout 0.01s 5604KB
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stdin
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6
0 15 48 789456 780000 526123
stdout
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1
https://ideone.com/kNlxLd
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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