Compilare: main.cpp: In function 'int solve1(char*)': main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < strlen(s); i++) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%s", &n, s); ^