运行 ID: 3193

Main.cc:1:9: error: #include expects "FILENAME" or 
 #include
         ^
Main.cc:2:9: error: #include expects "FILENAME" or 
 #include
         ^
Main.cc:3:11: error: ‘::main’ must return ‘int’
 void main()
           ^
Main.cc: In function ‘int main()’:
Main.cc:9:4: error: ‘ifstream’ was not declared in this scope
    ifstream istrm("f1.txt");
    ^~~~~~~~
Main.cc:7:8: warning: unused variable ‘a’ [-Wunused-variable]
    int a[N][M],sum=0;
        ^
Main.cc:7:16: warning: unused variable ‘sum’ [-Wunused-variable]
    int a[N][M],sum=0;
                ^~~
Main.cc:8:8: warning: unused variable ‘i’ [-Wunused-variable]
    int i,j;
        ^
Main.cc:8:10: warning: unused variable ‘j’ [-Wunused-variable]
    int i,j;
          ^
Main.cc:9:28: error: expected ‘}’ at end of input
    ifstream istrm("f1.txt");
                            ^