Compilare: main.cpp: In function 'void bfs(int, int)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[x].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp:10:19: warning: unused variable 'cnt' [-Wunused-variable] int x, y, i , cnt = 0; ^~~ main.cpp: In function 'void dfs(int)': main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:30: 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\n", sol.size()); ^ main.cpp:62:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < sol.size() ; i ++) ~~^~~~~~~~~~~~ main.cpp:46:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in", "r", stdin); ^ main.cpp:47:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out", "w", stdout); ^ main.cpp:49:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m , &start , &finish); ^ main.cpp:52:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^