Compilare: main.cpp: In function 'int main()': main.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < temp.size();++i) ~~^~~~~~~~~~~~~ main.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < temp.size();++i) ~~^~~~~~~~~~~~~ main.cpp:25:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ main.cpp:27:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", (s[i] + 1)); ^