Compilare: main.cpp: In function 'void solve()': main.cpp:98:18: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(i==M) ^ main.cpp:130:8: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=M;++i) ^~~ main.cpp:136:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout<<"\n"; ^~~~ main.cpp:146:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v.size();++k) ~^~~~~~~~~ main.cpp:168:10: warning: this 'for' clause does not guard... [-Wmisleading-indentation] {for(int j=1;j<=M;++j) ^~~ main.cpp:173:14: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout<<"\n"; ^~~~