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View Compilation Error

0_0_13601311_22212.cpp: In function 'int main()':
0_0_13601311_22212.cpp:17:28: error: 'ren' was not declared in this scope
   double meiren = mianji / ren;
                            ^
0_0_13601311_22212.cpp:22:5: error: 'po' was not declared in this scope
     po[i][0] = w;
     ^
0_0_13601311_22212.cpp:22:8: error: 'i' was not declared in this scope
     po[i][0] = w;
        ^
0_0_13601311_22212.cpp:28:4: error: 'po' was not declared in this scope
    po[i][0] = w - youchang;
    ^
0_0_13601311_22212.cpp:28:7: error: 'i' was not declared in this scope
    po[i][0] = w - youchang;
       ^
0_0_13601311_22212.cpp:34:4: error: 'po' was not declared in this scope
    po[i][0] = w - youchang;
    ^
0_0_13601311_22212.cpp:34:7: error: 'i' was not declared in this scope
    po[i][0] = w - youchang;
       ^
0_0_13601311_22212.cpp:37:23: error: 'po' was not declared in this scope
   double shengchang = po[i - 1][0];
                       ^
0_0_13601311_22212.cpp:37:26: error: 'i' was not declared in this scope
   double shengchang = po[i - 1][0];
                          ^


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