Compilare: user.cpp: In function ‘void solve()’: user.cpp:56:13: warning: this ‘while’ clause does not guard... [-Wmisleading-indentation] while(col[pos].first==line[i].second) ^~~~~ user.cpp:58:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘while’ pos++; ^~~ user.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mx<(line2-line1+1)*(col2-col1+1)) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~