View Compilation Error

0_0_27099391_19539.cpp: In function 'int main()':
0_0_27099391_19539.cpp:137:4: error: 'island' was not declared in this scope
    island[i] = island[i] - O;
    ^
0_0_27099391_19539.cpp:142:13: error: 'island' was not declared in this scope
    s = area(island[i], island[i + 1], R);
             ^