Compilare: main.cpp: In function 'void Mark(int, int)': main.cpp:96:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int a = 0; a < V[i].size(); ++ a) ~~^~~~~~~~~~~~~ main.cpp:97:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int b = 0; b < V[j].size(); ++ b) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:217:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int a = 0; a < V[i].size(); ++ a) ~~^~~~~~~~~~~~~ main.cpp:221:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int b = 0; b < V[white[j]].size(); ++ b) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:149:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp:161:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &white[i]); ^ main.cpp:189:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &adj); ^