Compilare: main.cpp: In function 'int main()': main.cpp:84:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind < components.size() && components[ind].nodes.size() == 1) ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = ind; i < components.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:125:48: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<Component>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n%d\n", ans, components.size() - 1); ^ main.cpp:56:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("conexidad.in", "r", stdin); ^ main.cpp:57:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("conexidad.out", "w", stdout); ^ main.cpp:61:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:66:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^