Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:21:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graf[last].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:45:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graf[0].size(); ++i) { ^ user.cpp:34:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.cpp:38:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%d %d ", &x, &y); ^ user.cpp:39:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%d\n", &cost[y][x]); ^