Compilare: main.cpp: In function 'void dijkstra1(short int)': main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[dest].size() ; i ++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'short int dijkstra2()': main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < T[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:139:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1 ; i <= G[dest].size() ; i ++) ~~^~~~~~~~~~~~~~~~~ main.cpp:113:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.in" , "r" , stdin); ^ main.cpp:114:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.out" , "w" , stdout); ^ main.cpp:117:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%d%hd%hd" , &n , &m , &k , &dest); ^ main.cpp:119:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd" , &v[i]); ^ main.cpp:122:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd" , &x , &y); ^