Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:75:40: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ", sol[i].size()); ^ main.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<sol[i].size(); j++) ~^~~~~~~~~~~~~~ main.cpp:92:41: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<Solutie>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", muchie.size()); ^ main.cpp:93:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<muchie.size(); i++) ~^~~~~~~~~~~~~~ main.cpp:58:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("biconex.in", "r", stdin); ^ main.cpp:59:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.out", "w", stdout); ^ main.cpp:61:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:63:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^