Eroare de compilare: main.cpp: In function 'bool valid(int)': main.cpp:61:27: error: unable to find numeric literal operator 'operator""first' if(k == 1) return a[v[1.first][v[1].second] == 0; ^~~~~~~ main.cpp:61:27: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes main.cpp:61:53: error: expected ']' before ';' token if(k == 1) return a[v[1.first][v[1].second] == 0; ^ main.cpp: In function 'void backtracking(int)': main.cpp:91:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < bune.size() && !found; i++) { ~~^~~~~~~~~~~~~ main.cpp:103:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[pl][pc].size() && !found; i++) { ~~^~~~~~~~~~~~~~~~~~ Non zero exit status: 1