Compilare: main.cpp: In function 'int DFS(int)': main.cpp:26:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:47:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void DFS2(int, int)': main.cpp:61:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:64:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:76:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:78:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:87:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.in", "r", stdin); ^ main.cpp:95:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.out", "w", stdout); ^ main.cpp:98:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:103:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^ main.cpp:107:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:115:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^