Compilare: main.cpp: In function 'void DFS(unsigned int)': main.cpp:7:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= Map[x][0]; i++ ) ~~^~~~~~~~~~~~ main.cpp:12:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= Map[x][0]; i++ ) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:26:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < N - 1; i++ ) ~~^~~~~~~ main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= N; i++ ) ~~^~~~ main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= K; i++ ) ~~^~~~ main.cpp:23:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "iepuri2.in", "r", stdin ); ^ main.cpp:24:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "iepuri2.out", "w", stdout ); ^ main.cpp:25:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%u%u", &N, &K ); ^ main.cpp:28:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%u%u", &a, &b ); ^