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:46:39: 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:60:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:75:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:77:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = (nod == 1 ? 0 : 1); i < edg[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:86:39: 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:93:37: 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:94:39: 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:97:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:102:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^ main.cpp:106:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:114:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^