Compilare: main.cpp:16:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:26:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(j=1;j<=m;++j) ^~~ main.cpp:28:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(i=1;i<=n*m;++i) ^~~ main.cpp:18:17: warning: unused variable 'mx' [-Wunused-variable] int q,i,j,x,mx=0; ^~