Compilare: main.cpp: In function 'void backt(int, int)': main.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = st[nr - 1]; i < div_cu_D_mare.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:71:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (!ciur[i]) ^~ main.cpp:73:7: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' ans[0] = 1000000000; ^~~