Compilare: main.cpp: In function 'void dijkstra(int, int)': main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[start_node].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:102:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[start_node].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:103:51: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(visited[g[start_node][i].first]==false&g[start_node][i].second<=li) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~ main.cpp: In function 'int main()': main.cpp:111:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.in", "r", stdin); ^ main.cpp:112:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.out", "w", stdout); ^ main.cpp:114:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &c); ^ main.cpp:115:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:117:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dragon[i]); ^ main.cpp:121:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &cost); ^